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data-view-component="true" class="octicon octicon-copilot color-fg-subtle mr-3"> <path d="M23.922 16.992c-.861 1.495-5.859 5.023-11.922 5.023-6.063 0-11.061-3.528-11.922-5.023A.641.641 0 0 1 0 16.736v-2.869a.841.841 0 0 1 .053-.22c.372-.935 1.347-2.292 2.605-2.656.167-.429.414-1.055.644-1.517a10.195 10.195 0 0 1-.052-1.086c0-1.331.282-2.499 1.132-3.368.397-.406.89-.717 1.474-.952 1.399-1.136 3.392-2.093 6.122-2.093 2.731 0 4.767.957 6.166 2.093.584.235 1.077.546 1.474.952.85.869 1.132 2.037 1.132 3.368 0 .368-.014.733-.052 1.086.23.462.477 1.088.644 1.517 1.258.364 2.233 1.721 2.605 2.656a.832.832 0 0 1 .053.22v2.869a.641.641 0 0 1-.078.256ZM12.172 11h-.344a4.323 4.323 0 0 1-.355.508C10.703 12.455 9.555 13 7.965 13c-1.725 0-2.989-.359-3.782-1.259a2.005 2.005 0 0 1-.085-.104L4 11.741v6.585c1.435.779 4.514 2.179 8 2.179 3.486 0 6.565-1.4 8-2.179v-6.585l-.098-.104s-.033.045-.085.104c-.793.9-2.057 1.259-3.782 1.259-1.59 0-2.738-.545-3.508-1.492a4.323 4.323 0 0 1-.355-.508h-.016.016Zm.641-2.935c.136 1.057.403 1.913.878 2.497.442.544 1.134.938 2.344.938 1.573 0 2.292-.337 2.657-.751.384-.435.558-1.15.558-2.361 0-1.14-.243-1.847-.705-2.319-.477-.488-1.319-.862-2.824-1.025-1.487-.161-2.192.138-2.533.529-.269.307-.437.808-.438 1.578v.021c0 .265.021.562.063.893Zm-1.626 0c.042-.331.063-.628.063-.894v-.02c-.001-.77-.169-1.271-.438-1.578-.341-.391-1.046-.69-2.533-.529-1.505.163-2.347.537-2.824 1.025-.462.472-.705 1.179-.705 2.319 0 1.211.175 1.926.558 2.361.365.414 1.084.751 2.657.751 1.21 0 1.902-.394 2.344-.938.475-.584.742-1.44.878-2.497Z"></path><path d="M14.5 14.25a1 1 0 0 1 1 1v2a1 1 0 0 1-2 0v-2a1 1 0 0 1 1-1Zm-5 0a1 1 0 0 1 1 1v2a1 1 0 0 1-2 0v-2a1 1 0 0 1 1-1Z"></path> </svg> <div> <div class="color-fg-default h4">GitHub Copilot</div> Write better code with AI </div> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description pb-lg-3" 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2h3.5a.75.75 0 0 1 0 1.5h-3.5a.25.25 0 0 0-.25.25v8.5c0 .138.112.25.25.25h8.5a.25.25 0 0 0 .25-.25v-3.5a.75.75 0 0 1 1.5 0v3.5A1.75 1.75 0 0 1 12.25 14h-8.5A1.75 1.75 0 0 1 2 12.25v-8.5C2 2.784 2.784 2 3.75 2Zm6.854-1h4.146a.25.25 0 0 1 .25.25v4.146a.25.25 0 0 1-.427.177L13.03 4.03 9.28 7.78a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042l3.75-3.75-1.543-1.543A.25.25 0 0 1 10.604 1Z"></path> </svg> </a></li> </ul> </div> </div> </div> </li> <li class="HeaderMenu-item position-relative flex-wrap flex-justify-between flex-items-center d-block d-lg-flex flex-lg-nowrap flex-lg-items-center js-details-container js-header-menu-item"> <button type="button" class="HeaderMenu-link border-0 width-full width-lg-auto px-0 px-lg-2 py-lg-2 no-wrap d-flex flex-items-center flex-justify-between js-details-target" aria-expanded="false"> Solutions <svg opacity="0.5" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon 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0 1 1.06 0Z"></path> </svg> </button> <div class="HeaderMenu-dropdown dropdown-menu rounded m-0 p-0 pt-2 pt-lg-4 position-relative position-lg-absolute left-0 left-lg-n3 pb-2 pb-lg-4 px-lg-4"> <div class="HeaderMenu-column"> <div class="border-bottom pb-3 pb-lg-0 pb-lg-3 mb-3 mb-lg-0 mb-lg-3"> <ul class="list-style-none f5" > <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description" data-analytics-event="{"location":"navbar","action":"github_sponsors","context":"open_source","tag":"link","label":"github_sponsors_link_open_source_navbar"}" href="/sponsors"> <div> <div class="color-fg-default h4">GitHub Sponsors</div> Fund open source developers </div> </a></li> </ul> </div> <div class="border-bottom pb-3 pb-lg-0 pb-lg-3 mb-3 mb-lg-0 mb-lg-3"> <ul class="list-style-none f5" > <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center 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role="listbox" class="ActionListWrap QueryBuilder-ListWrap" aria-label="Suggestions" data-action=" combobox-commit:query-builder#comboboxCommit mousedown:query-builder#resultsMousedown " data-target="query-builder.resultsList" data-persist-list=false id="query-builder-test-results" ></ul> </div> <div class="FormControl-inlineValidation" id="validation-63d20d70-987d-4ec2-8cdf-d55c0c6917cc" hidden="hidden"> <span class="FormControl-inlineValidation--visual"> <svg aria-hidden="true" height="12" viewBox="0 0 12 12" version="1.1" width="12" data-view-component="true" class="octicon octicon-alert-fill"> <path d="M4.855.708c.5-.896 1.79-.896 2.29 0l4.675 8.351a1.312 1.312 0 0 1-1.146 1.954H1.33A1.313 1.313 0 0 1 .183 9.058ZM7 7V3H5v4Zm-1 3a1 1 0 1 0 0-2 1 1 0 0 0 0 2Z"></path> </svg> </span> <span></span> </div> </div> <div data-target="query-builder.screenReaderFeedback" aria-live="polite" aria-atomic="true" class="sr-only"></div> </query-builder></form> <div class="d-flex flex-row color-fg-muted px-3 text-small color-bg-default search-feedback-prompt"> <a target="_blank" href="https://docs.github.com/search-github/github-code-search/understanding-github-code-search-syntax" data-view-component="true" class="Link color-fg-accent text-normal ml-2">Search syntax tips</a> <div class="d-flex flex-1"></div> </div> </div> </div> </div> </modal-dialog></div> </div> <div data-action="click:qbsearch-input#retract" class="dark-backdrop position-fixed" hidden data-target="qbsearch-input.darkBackdrop"></div> <div class="color-fg-default"> <dialog-helper> <dialog data-target="qbsearch-input.feedbackDialog" data-action="close:qbsearch-input#handleDialogClose cancel:qbsearch-input#handleDialogClose" id="feedback-dialog" aria-modal="true" aria-labelledby="feedback-dialog-title" aria-describedby="feedback-dialog-description" data-view-component="true" class="Overlay Overlay-whenNarrow Overlay--size-medium Overlay--motion-scaleFade Overlay--disableScroll"> <div 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--></option></form><form id="code-search-feedback-form" data-turbo="false" action="/search/feedback" accept-charset="UTF-8" method="post"><input type="hidden" data-csrf="true" name="authenticity_token" value="pCCjHrHuerGTpBZqIV9HUxn4XXauY1/Af7/juxqFzBWDpzliXf64FzPEfF80ExfZZFgQ8A0JKoj5OocwzjxJAA==" /> <p>We read every piece of feedback, and take your input very seriously.</p> <textarea name="feedback" class="form-control width-full mb-2" style="height: 120px" id="feedback"></textarea> <input name="include_email" id="include_email" aria-label="Include my email address so I can be contacted" class="form-control mr-2" type="checkbox"> <label for="include_email" style="font-weight: normal">Include my email address so I can be contacted</label> </form></div> </scrollable-region> <div data-view-component="true" class="Overlay-footer Overlay-footer--alignEnd"> <button data-close-dialog-id="feedback-dialog" type="button" data-view-component="true" class="btn"> Cancel </button> <button 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data-target="custom-scopes.createCustomScopeForm"> <!-- '"` --><!-- </textarea></xmp> --></option></form><form id="custom-scopes-dialog-form" data-turbo="false" action="/search/custom_scopes" accept-charset="UTF-8" method="post"><input type="hidden" data-csrf="true" name="authenticity_token" value="SD8/9nzCTty9uoXa4p74b16UhO7RidvnuF41aVPHxuItMLC14kybLLAJvOOCMhRDbX880qEl1mbs+TA7dix9YA==" /> <div data-target="custom-scopes.customScopesModalDialogFlash"></div> <input type="hidden" id="custom_scope_id" name="custom_scope_id" data-target="custom-scopes.customScopesIdField"> <div class="form-group"> <label for="custom_scope_name">Name</label> <auto-check src="/search/custom_scopes/check_name" required only-validate-on-blur="false"> <input type="text" name="custom_scope_name" id="custom_scope_name" data-target="custom-scopes.customScopesNameField" class="form-control" autocomplete="off" placeholder="github-ruby" required maxlength="50"> <input type="hidden" data-csrf="true" 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dir=\"auto\"\u003ePurefun\u003c/h1\u003e\u003ca id=\"user-content-purefun\" class=\"anchor\" aria-label=\"Permalink: Purefun\" href=\"#purefun\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\" ____ __ \n| _ \\ _ _ _ __ ___ / _|_ _ _ __ \n| |_) | | | | '__/ _ \\ |_| | | | '_ \\ \n| __/| |_| | | | __/ _| |_| | | | |\n|_| \\__,_|_| \\___|_| \\__,_|_| |_|\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003e ____ __ \n| _ \\ _ _ _ __ ___ / _|_ _ _ __ \n| |_) | | | | '__/ _ \\ |_| | | | '_ \\ \n| __/| |_| | | | __/ _| |_| | | | |\n|_| \\__,_|_| \\___|_| \\__,_|_| |_|\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003ca target=\"_blank\" rel=\"noopener noreferrer\" href=\"https://github.com/tonivade/purefun/workflows/Java%20CI%20with%20Gradle/badge.svg\"\u003e\u003cimg src=\"https://github.com/tonivade/purefun/workflows/Java%20CI%20with%20Gradle/badge.svg\" alt=\"Build Status\" style=\"max-width: 100%;\"\u003e\u003c/a\u003e\n\u003ca href=\"https://www.codacy.com/app/zeromock/purefun?utm_source=github.com\u0026amp;utm_medium=referral\u0026amp;utm_content=tonivade/purefun\u0026amp;utm_campaign=Badge_Coverage\" rel=\"nofollow\"\u003e\u003cimg src=\"https://camo.githubusercontent.com/997f127f161e2271dab05170420f449c93747439bd7cde7b8a38d29514002415/68747470733a2f2f6170692e636f646163792e636f6d2f70726f6a6563742f62616467652f436f7665726167652f3338343232646231363164613438663039636431393263376537636161376464\" alt=\"Codacy Badge\" data-canonical-src=\"https://api.codacy.com/project/badge/Coverage/38422db161da48f09cd192c7e7caa7dd\" style=\"max-width: 100%;\"\u003e\u003c/a\u003e\n\u003ca href=\"https://gitter.im/tonivade/purefun?utm_source=badge\u0026amp;utm_medium=badge\u0026amp;utm_campaign=pr-badge\u0026amp;utm_content=badge\" rel=\"nofollow\"\u003e\u003cimg src=\"https://camo.githubusercontent.com/d9856b21439449403f252aef1cd3ab62f97725f0ace6f6111eee8868de2ce93f/68747470733a2f2f6261646765732e6769747465722e696d2f746f6e69766164652f7075726566756e2e737667\" alt=\"Join the chat at https://gitter.im/tonivade/purefun\" data-canonical-src=\"https://badges.gitter.im/tonivade/purefun.svg\" style=\"max-width: 100%;\"\u003e\u003c/a\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThis module was developed as the core of the zeromock project. It defines all the basic classes and interfaces\nused in the rest of the project.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eInitially the module only held a few basic interfaces and it has grown to become an entire\nfunctional programming library (well, a humble one), and now is an independent library.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eWorking in this library helped me to learn and understand some important concepts\nof functional programming, and over time I implemented higher kinded types and type classes\nin Java. I don't know if this will be helpful for somebody, but the work is here to everyone want to use it.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eFinally, I have to say thanks to \u003ca href=\"https://www.vavr.io/\" rel=\"nofollow\"\u003evavr\u003c/a\u003e library author, this library is largely inspired in his work,\nand also to \u003ca href=\"https://www.scala-lang.org/\" rel=\"nofollow\"\u003eScala\u003c/a\u003e standard library authors. I don't want to forget some of the projects I've used as\nreference: \u003ca href=\"https://arrow-kt.io/\" rel=\"nofollow\"\u003eArrow\u003c/a\u003e and \u003ca href=\"https://typelevel.org/cats/\" rel=\"nofollow\"\u003ecats\u003c/a\u003e for type classes implementation,\n\u003ca href=\"https://fs2.io/\" rel=\"nofollow\"\u003efs2\u003c/a\u003e for stream processing, and \u003ca href=\"https://zio.dev/\" rel=\"nofollow\"\u003eZIO\u003c/a\u003e to implement my own version in Java.\nTheir awesome work help me a lot.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eDisclaimer\u003c/h2\u003e\u003ca id=\"user-content-disclaimer\" class=\"anchor\" aria-label=\"Permalink: Disclaimer\" href=\"#disclaimer\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eThis project is not ready to be used in production\u003c/strong\u003e, I use it to learn functional programming concepts by my self, but,\nif you want to use it, \u003cstrong\u003euse it at your own risk\u003c/strong\u003e. Anyway if you think is useful for you, go ahead, also any\nfeedback and PR are very welcome.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eHigher Kinded Types\u003c/h2\u003e\u003ca id=\"user-content-higher-kinded-types\" class=\"anchor\" aria-label=\"Permalink: Higher Kinded Types\" href=\"#higher-kinded-types\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIn this project I have implemented some patterns of functional programming that need Higher Kinded Types. In Java\nthere are not such thing, but it can be simulated using a especial codification of types.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIn Scala we can define a higher kinded typed just like this \u003ccode\u003eMonad[F[_]]\u003c/code\u003e but in Java it can be codified\nlike this \u003ccode\u003eMonad\u0026lt;F\u0026gt;\u003c/code\u003e. Then we can define a type using a special codification like this:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"interface SomeType\u0026lt;T\u0026gt; extends SomeTypeOf\u0026lt;T\u0026gt; { }\n\n// Boilerplate\ninterface SomeTypeOf\u0026lt;T\u0026gt; implements Kind\u0026lt;SomeType\u0026lt;?\u0026gt;, T\u0026gt; {\n\n // this is a safe cast\n static SomeType\u0026lt;T\u0026gt; toSomeType(Kind\u0026lt;SomeType\u0026lt;?\u0026gt;, ? extends T\u0026gt; hkt) {\n return (SomeType\u0026lt;T\u0026gt;) hkt;\n }\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003einterface\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eSomeType\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eT\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-k\"\u003eextends\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eSomeTypeOf\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eT\u003c/span\u003e\u0026gt; { }\n\n\u003cspan class=\"pl-c\"\u003e// Boilerplate\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003einterface\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eSomeTypeOf\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eT\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-k\"\u003eimplements\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eSomeType\u003c/span\u003e\u0026lt;?\u0026gt;, \u003cspan class=\"pl-s1\"\u003eT\u003c/span\u003e\u0026gt; {\n\n \u003cspan class=\"pl-c\"\u003e// this is a safe cast\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003estatic\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eSomeType\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eT\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-en\"\u003etoSomeType\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eSomeType\u003c/span\u003e\u0026lt;?\u0026gt;, ? \u003cspan class=\"pl-k\"\u003eextends\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eT\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003ehkt\u003c/span\u003e) {\n \u003cspan class=\"pl-k\"\u003ereturn\u003c/span\u003e (\u003cspan class=\"pl-smi\"\u003eSomeType\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eT\u003c/span\u003e\u0026gt;) \u003cspan class=\"pl-s1\"\u003ehkt\u003c/span\u003e;\n }\n}\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIt can be triky but, in the end is easy to work with. By the way, I tried to hide this details to the user of the library.\nExcept with type classes because is the only way to implement them correctly.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eSo, there are interfaces to encode kinds of 1, 2 and 3 types. It can be defined types for 4, 5 or more types, but it wasn't\nnecessary to implement the library.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eAnnotation Processor\u003c/h2\u003e\u003ca id=\"user-content-annotation-processor\" class=\"anchor\" aria-label=\"Permalink: Annotation Processor\" href=\"#annotation-processor\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIn order to simplify working with higher kinded types, in the last version I've included an annotation processor to generate\nall this boilerplate code:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"@HigherKind\ninterface SomeType\u0026lt;T\u0026gt; extends SomeTypeOf\u0026lt;T\u0026gt; { }\"\u003e\u003cpre\u003e\u003cspan class=\"pl-c1\"\u003e@\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003eHigherKind\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003einterface\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eSomeType\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eT\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-k\"\u003eextends\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eSomeTypeOf\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eT\u003c/span\u003e\u0026gt; { }\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eWith this annotation, all the above code, is generated automatically.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eData types\u003c/h2\u003e\u003ca id=\"user-content-data-types\" class=\"anchor\" aria-label=\"Permalink: Data types\" href=\"#data-types\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eOption\u003c/h3\u003e\u003ca id=\"user-content-option\" class=\"anchor\" aria-label=\"Permalink: Option\" href=\"#option\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIs an alternative to \u003ccode\u003eOptional\u003c/code\u003e of Java standard library. It can contains two values, a \u003ccode\u003esome\u003c/code\u003e or a \u003ccode\u003enone\u003c/code\u003e\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"Option\u0026lt;String\u0026gt; some = Option.some(\u0026quot;Hello world\u0026quot;);\n\nOption\u0026lt;String\u0026gt; none = Option.none();\"\u003e\u003cpre\u003e\u003cspan class=\"pl-smi\"\u003eOption\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003esome\u003c/span\u003e = \u003cspan class=\"pl-smi\"\u003eOption\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003esome\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"Hello world\"\u003c/span\u003e);\n\n\u003cspan class=\"pl-smi\"\u003eOption\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003enone\u003c/span\u003e = \u003cspan class=\"pl-smi\"\u003eOption\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003enone\u003c/span\u003e();\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eTry\u003c/h3\u003e\u003ca id=\"user-content-try\" class=\"anchor\" aria-label=\"Permalink: Try\" href=\"#try\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIs an implementation of scala \u003ccode\u003eTry\u003c/code\u003e in Java. It can contains two values, a \u003ccode\u003esuccess\u003c/code\u003e or a \u003ccode\u003efailure\u003c/code\u003e.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"Try\u0026lt;String\u0026gt; success = Try.success(\u0026quot;Hello world\u0026quot;);\n\nTry\u0026lt;String\u0026gt; failure = Try.failure(new RuntimeException(\u0026quot;Error\u0026quot;));\"\u003e\u003cpre\u003e\u003cspan class=\"pl-smi\"\u003eTry\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003esuccess\u003c/span\u003e = \u003cspan class=\"pl-smi\"\u003eTry\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003esuccess\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"Hello world\"\u003c/span\u003e);\n\n\u003cspan class=\"pl-smi\"\u003eTry\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003efailure\u003c/span\u003e = \u003cspan class=\"pl-smi\"\u003eTry\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003efailure\u003c/span\u003e(\u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eRuntimeException\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"Error\"\u003c/span\u003e));\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eEither\u003c/h3\u003e\u003ca id=\"user-content-either\" class=\"anchor\" aria-label=\"Permalink: Either\" href=\"#either\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIs an implementation of scala \u003ccode\u003eEither\u003c/code\u003e in Java.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"Either\u0026lt;Integer, String\u0026gt; right = Either.right(\u0026quot;Hello world\u0026quot;);\n\nEither\u0026lt;Integer, String\u0026gt; left = Either.left(100);\"\u003e\u003cpre\u003e\u003cspan class=\"pl-smi\"\u003eEither\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eInteger\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003eright\u003c/span\u003e = \u003cspan class=\"pl-smi\"\u003eEither\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eright\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"Hello world\"\u003c/span\u003e);\n\n\u003cspan class=\"pl-smi\"\u003eEither\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eInteger\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003eleft\u003c/span\u003e = \u003cspan class=\"pl-smi\"\u003eEither\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eleft\u003c/span\u003e(\u003cspan class=\"pl-c1\"\u003e100\u003c/span\u003e);\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eValidation\u003c/h3\u003e\u003ca id=\"user-content-validation\" class=\"anchor\" aria-label=\"Permalink: Validation\" href=\"#validation\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis type represents two different states, valid or invalid, an also it allows to combine several\nvalidations using \u003ccode\u003emapN\u003c/code\u003e methods.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"Validation\u0026lt;String, String\u0026gt; name = Validation.valid(\u0026quot;John Smith\u0026quot;);\nValidation\u0026lt;String, String\u0026gt; email = Validation.valid(\u0026quot;john.smith@example.net\u0026quot;);\n\n// Person has a constructor with two String parameters, name and email.\nValdation\u0026lt;Sequence\u0026lt;String\u0026gt;, Person\u0026gt; person = Validation.map2(name, email, Person::new);\"\u003e\u003cpre\u003e\u003cspan class=\"pl-smi\"\u003eValidation\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003ename\u003c/span\u003e = \u003cspan class=\"pl-smi\"\u003eValidation\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003evalid\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"John Smith\"\u003c/span\u003e);\n\u003cspan class=\"pl-smi\"\u003eValidation\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003eemail\u003c/span\u003e = \u003cspan class=\"pl-smi\"\u003eValidation\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003evalid\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"john.smith@example.net\"\u003c/span\u003e);\n\n\u003cspan class=\"pl-c\"\u003e// Person has a constructor with two String parameters, name and email.\u003c/span\u003e\n\u003cspan class=\"pl-smi\"\u003eValdation\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eSequence\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e\u0026gt;, \u003cspan class=\"pl-smi\"\u003ePerson\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003eperson\u003c/span\u003e = \u003cspan class=\"pl-smi\"\u003eValidation\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003emap2\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003ename\u003c/span\u003e, \u003cspan class=\"pl-s1\"\u003eemail\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003ePerson\u003c/span\u003e::\u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e);\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eConst\u003c/h3\u003e\u003ca id=\"user-content-const\" class=\"anchor\" aria-label=\"Permalink: Const\" href=\"#const\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eA object with a phantom parameter:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"Const\u0026lt;String, Integer\u0026gt; constInt = Const.of(\u0026quot;Hello world!\u0026quot;);\n\nConst\u0026lt;String, Float\u0026gt; constFloat = constInt.retag();\n\nassertEquals(\u0026quot;Hello world!\u0026quot;, constFloat.value());\"\u003e\u003cpre\u003e\u003cspan class=\"pl-smi\"\u003eConst\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eInteger\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003econstInt\u003c/span\u003e = \u003cspan class=\"pl-smi\"\u003eConst\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eof\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"Hello world!\"\u003c/span\u003e);\n\n\u003cspan class=\"pl-smi\"\u003eConst\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eFloat\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003econstFloat\u003c/span\u003e = \u003cspan class=\"pl-s1\"\u003econstInt\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eretag\u003c/span\u003e();\n\n\u003cspan class=\"pl-en\"\u003eassertEquals\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"Hello world!\"\u003c/span\u003e, \u003cspan class=\"pl-s1\"\u003econstFloat\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003evalue\u003c/span\u003e());\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eFuture\u003c/h3\u003e\u003ca id=\"user-content-future\" class=\"anchor\" aria-label=\"Permalink: Future\" href=\"#future\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis is an experimental implementation of Future. Computations are executed in another thread inmediatelly (since version 5.0 de default executor is a virtual thread per task executor).\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"Future\u0026lt;String\u0026gt; future = Future.success(\u0026quot;Hello world!\u0026quot;);\n\nFuture\u0026lt;String\u0026gt; result = future.flatMap(string -\u0026gt; Future.run(string::toUpperCase));\n\nassertEquals(Try.success(\u0026quot;HELLO WORLD!\u0026quot;), result.await());\"\u003e\u003cpre\u003e\u003cspan class=\"pl-smi\"\u003eFuture\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003efuture\u003c/span\u003e = \u003cspan class=\"pl-smi\"\u003eFuture\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003esuccess\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"Hello world!\"\u003c/span\u003e);\n\n\u003cspan class=\"pl-smi\"\u003eFuture\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003eresult\u003c/span\u003e = \u003cspan class=\"pl-s1\"\u003efuture\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eflatMap\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003estring\u003c/span\u003e -\u0026gt; \u003cspan class=\"pl-smi\"\u003eFuture\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003erun\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003estring\u003c/span\u003e::\u003cspan class=\"pl-s1\"\u003etoUpperCase\u003c/span\u003e));\n\n\u003cspan class=\"pl-en\"\u003eassertEquals\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eTry\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003esuccess\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"HELLO WORLD!\"\u003c/span\u003e), \u003cspan class=\"pl-s1\"\u003eresult\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eawait\u003c/span\u003e());\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eTrampoline\u003c/h3\u003e\u003ca id=\"user-content-trampoline\" class=\"anchor\" aria-label=\"Permalink: Trampoline\" href=\"#trampoline\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eImplements recursion using an iteration and is stack safe.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"private Trampoline\u0026lt;Integer\u0026gt; fibLoop(Integer n) {\n if (n \u0026lt; 2) {\n return Trampoline.done(n);\n }\n return Trampoline.more(() -\u0026gt; fibLoop(n - 1)).flatMap(x -\u0026gt; fibLoop(n - 2).map(y -\u0026gt; x + y));\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003eprivate\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eTrampoline\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eInteger\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-en\"\u003efibLoop\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eInteger\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003en\u003c/span\u003e) {\n \u003cspan class=\"pl-k\"\u003eif\u003c/span\u003e (\u003cspan class=\"pl-s1\"\u003en\u003c/span\u003e \u0026lt; \u003cspan class=\"pl-c1\"\u003e2\u003c/span\u003e) {\n \u003cspan class=\"pl-k\"\u003ereturn\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eTrampoline\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003edone\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003en\u003c/span\u003e);\n }\n \u003cspan class=\"pl-k\"\u003ereturn\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eTrampoline\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003emore\u003c/span\u003e(() -\u0026gt; \u003cspan class=\"pl-en\"\u003efibLoop\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003en\u003c/span\u003e - \u003cspan class=\"pl-c1\"\u003e1\u003c/span\u003e)).\u003cspan class=\"pl-en\"\u003eflatMap\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003ex\u003c/span\u003e -\u0026gt; \u003cspan class=\"pl-en\"\u003efibLoop\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003en\u003c/span\u003e - \u003cspan class=\"pl-c1\"\u003e2\u003c/span\u003e).\u003cspan class=\"pl-en\"\u003emap\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003ey\u003c/span\u003e -\u0026gt; \u003cspan class=\"pl-s1\"\u003ex\u003c/span\u003e + \u003cspan class=\"pl-s1\"\u003ey\u003c/span\u003e));\n}\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eTuples\u003c/h3\u003e\u003ca id=\"user-content-tuples\" class=\"anchor\" aria-label=\"Permalink: Tuples\" href=\"#tuples\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThese classes allow to hold some values together, as tuples. There are tuples from 1 to 5.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"Tuple1\u0026lt;String\u0026gt; tuple1 = Tuple.of(\u0026quot;Hello world\u0026quot;);\n\nTuple2\u0026lt;String, Integer\u0026gt; tuple2 = Tuple.of(\u0026quot;John Smith\u0026quot;, 100);\"\u003e\u003cpre\u003e\u003cspan class=\"pl-smi\"\u003eTuple1\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003etuple1\u003c/span\u003e = \u003cspan class=\"pl-smi\"\u003eTuple\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eof\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"Hello world\"\u003c/span\u003e);\n\n\u003cspan class=\"pl-smi\"\u003eTuple2\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eInteger\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003etuple2\u003c/span\u003e = \u003cspan class=\"pl-smi\"\u003eTuple\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eof\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"John Smith\"\u003c/span\u003e, \u003cspan class=\"pl-c1\"\u003e100\u003c/span\u003e);\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eData structures\u003c/h2\u003e\u003ca id=\"user-content-data-structures\" class=\"anchor\" aria-label=\"Permalink: Data structures\" href=\"#data-structures\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eJava doesn't define immutable collections, so I have implemented some of them.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eSequence\u003c/h3\u003e\u003ca id=\"user-content-sequence\" class=\"anchor\" aria-label=\"Permalink: Sequence\" href=\"#sequence\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIs the equivalent to java \u003ccode\u003eCollection\u003c/code\u003e interface. It defines all the common methods. The default implementation use persistent collections based on \u003ca href=\"https://github.com/hrldcpr/pcollections/\"\u003epcollections\u003c/a\u003e library.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eImmutableList\u003c/h3\u003e\u003ca id=\"user-content-immutablelist\" class=\"anchor\" aria-label=\"Permalink: ImmutableList\" href=\"#immutablelist\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIt represents a linked list. It has a head and a tail. Based on \u003ccode\u003eConsPStack\u003c/code\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eImmutableSet\u003c/h3\u003e\u003ca id=\"user-content-immutableset\" class=\"anchor\" aria-label=\"Permalink: ImmutableSet\" href=\"#immutableset\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIt represents a set of elements. This elements cannot be duplicated. Based on \u003ccode\u003eHashTreePSet\u003c/code\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eImmutableArray\u003c/h3\u003e\u003ca id=\"user-content-immutablearray\" class=\"anchor\" aria-label=\"Permalink: ImmutableArray\" href=\"#immutablearray\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIt represents an array. You can access to the elements by its position in the array. Based on \u003ccode\u003eTreePVector\u003c/code\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eImmutableMap\u003c/h3\u003e\u003ca id=\"user-content-immutablemap\" class=\"anchor\" aria-label=\"Permalink: ImmutableMap\" href=\"#immutablemap\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis class represents a hash map. Based on \u003ccode\u003eHashTreePMap\u003c/code\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eImmutableTree\u003c/h3\u003e\u003ca id=\"user-content-immutabletree\" class=\"anchor\" aria-label=\"Permalink: ImmutableTree\" href=\"#immutabletree\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis class represents a binary tree. Based on \u003ccode\u003eTreePSet\u003c/code\u003e\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eImmutableTreeMap\u003c/h3\u003e\u003ca id=\"user-content-immutabletreemap\" class=\"anchor\" aria-label=\"Permalink: ImmutableTreeMap\" href=\"#immutabletreemap\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis class represents a binary tree map. Based on \u003ccode\u003eTreePMap\u003c/code\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eMonads\u003c/h2\u003e\u003ca id=\"user-content-monads\" class=\"anchor\" aria-label=\"Permalink: Monads\" href=\"#monads\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eAlso I have implemented some Monads that allows to combine some operations.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eState Monad\u003c/h3\u003e\u003ca id=\"user-content-state-monad\" class=\"anchor\" aria-label=\"Permalink: State Monad\" href=\"#state-monad\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIs the traditional State Modad from FP languages, like Haskel or Scala. It allows to combine\noperations over a state. The state should be a immutable class. It recives an state and generates\na tuple with the new state and an intermediate result.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"State\u0026lt;ImmutableList\u0026lt;String\u0026gt;, Option\u0026lt;String\u0026gt;\u0026gt; read = State.state(list -\u0026gt; Tuple.of(list.tail(), list.head()));\n\nTuple\u0026lt;ImmutableList\u0026lt;String\u0026gt;, Option\u0026lt;String\u0026gt;\u0026gt; result = read.run(ImmutableList.of(\u0026quot;a\u0026quot;, \u0026quot;b\u0026quot;, \u0026quot;c\u0026quot;));\n\nassertEquals(Tuple.of(ImmutableList.of(\u0026quot;b\u0026quot;, \u0026quot;c\u0026quot;), Option.some(\u0026quot;a\u0026quot;)), result);\"\u003e\u003cpre\u003e\u003cspan class=\"pl-smi\"\u003eState\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eImmutableList\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e\u0026gt;, \u003cspan class=\"pl-smi\"\u003eOption\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e\u0026gt;\u0026gt; \u003cspan class=\"pl-s1\"\u003eread\u003c/span\u003e = \u003cspan class=\"pl-smi\"\u003eState\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003estate\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003elist\u003c/span\u003e -\u0026gt; \u003cspan class=\"pl-smi\"\u003eTuple\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eof\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003elist\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003etail\u003c/span\u003e(), \u003cspan class=\"pl-s1\"\u003elist\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003ehead\u003c/span\u003e()));\n\n\u003cspan class=\"pl-smi\"\u003eTuple\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eImmutableList\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e\u0026gt;, \u003cspan class=\"pl-smi\"\u003eOption\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e\u0026gt;\u0026gt; \u003cspan class=\"pl-s1\"\u003eresult\u003c/span\u003e = \u003cspan class=\"pl-s1\"\u003eread\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003erun\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eImmutableList\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eof\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"a\"\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e\"b\"\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e\"c\"\u003c/span\u003e));\n\n\u003cspan class=\"pl-en\"\u003eassertEquals\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eTuple\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eof\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eImmutableList\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eof\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"b\"\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e\"c\"\u003c/span\u003e), \u003cspan class=\"pl-smi\"\u003eOption\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003esome\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"a\"\u003c/span\u003e)), \u003cspan class=\"pl-s1\"\u003eresult\u003c/span\u003e);\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eReader Monad\u003c/h3\u003e\u003ca id=\"user-content-reader-monad\" class=\"anchor\" aria-label=\"Permalink: Reader Monad\" href=\"#reader-monad\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis is an implementation of Reader Monad. It allows to combine operations over a common input.\nIt can be used to inject dependencies.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"Reader\u0026lt;ImmutableList\u0026lt;String\u0026gt;, String\u0026gt; read2 = Reader.reader(list -\u0026gt; list.tail().head().orElse(\u0026quot;\u0026quot;));\n\nString result = read2.eval(ImmutableList.of(\u0026quot;a\u0026quot;, \u0026quot;b\u0026quot;, \u0026quot;c\u0026quot;));\n\nassertEqual(\u0026quot;b\u0026quot;, result);\"\u003e\u003cpre\u003e\u003cspan class=\"pl-smi\"\u003eReader\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eImmutableList\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e\u0026gt;, \u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003eread2\u003c/span\u003e = \u003cspan class=\"pl-smi\"\u003eReader\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003ereader\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003elist\u003c/span\u003e -\u0026gt; \u003cspan class=\"pl-s1\"\u003elist\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003etail\u003c/span\u003e().\u003cspan class=\"pl-en\"\u003ehead\u003c/span\u003e().\u003cspan class=\"pl-en\"\u003eorElse\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"\"\u003c/span\u003e));\n\n\u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eresult\u003c/span\u003e = \u003cspan class=\"pl-s1\"\u003eread2\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eeval\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eImmutableList\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eof\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"a\"\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e\"b\"\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e\"c\"\u003c/span\u003e));\n\n\u003cspan class=\"pl-en\"\u003eassertEqual\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"b\"\u003c/span\u003e, \u003cspan class=\"pl-s1\"\u003eresult\u003c/span\u003e);\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eWriter Monad\u003c/h3\u003e\u003ca id=\"user-content-writer-monad\" class=\"anchor\" aria-label=\"Permalink: Writer Monad\" href=\"#writer-monad\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIt allow to combine operations over a common output.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"Writer\u0026lt;ImmutableList\u0026lt;String\u0026gt;, Integer\u0026gt; writer = Writer.\u0026lt;String, Integer\u0026gt;listPure(5)\n .flatMap(value -\u0026gt; listWriter(\u0026quot;add 5\u0026quot;, value + 5))\n .flatMap(value -\u0026gt; listWriter(\u0026quot;plus 2\u0026quot;, value * 2));\n\nassertAll(() -\u0026gt; assertEquals(Integer.valueOf(20), writer.getValue()),\n () -\u0026gt; assertEquals(listOf(\u0026quot;add 5\u0026quot;, \u0026quot;plus 2\u0026quot;), writer.getLog()));\"\u003e\u003cpre\u003e\u003cspan class=\"pl-smi\"\u003eWriter\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eImmutableList\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e\u0026gt;, \u003cspan class=\"pl-smi\"\u003eInteger\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003ewriter\u003c/span\u003e = \u003cspan class=\"pl-smi\"\u003eWriter\u003c/span\u003e.\u0026lt;\u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eInteger\u003c/span\u003e\u0026gt;\u003cspan class=\"pl-en\"\u003elistPure\u003c/span\u003e(\u003cspan class=\"pl-c1\"\u003e5\u003c/span\u003e)\n .\u003cspan class=\"pl-en\"\u003eflatMap\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e -\u0026gt; \u003cspan class=\"pl-en\"\u003elistWriter\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"add 5\"\u003c/span\u003e, \u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e + \u003cspan class=\"pl-c1\"\u003e5\u003c/span\u003e))\n .\u003cspan class=\"pl-en\"\u003eflatMap\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e -\u0026gt; \u003cspan class=\"pl-en\"\u003elistWriter\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"plus 2\"\u003c/span\u003e, \u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e * \u003cspan class=\"pl-c1\"\u003e2\u003c/span\u003e));\n\n\u003cspan class=\"pl-en\"\u003eassertAll\u003c/span\u003e(() -\u0026gt; \u003cspan class=\"pl-en\"\u003eassertEquals\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eInteger\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003evalueOf\u003c/span\u003e(\u003cspan class=\"pl-c1\"\u003e20\u003c/span\u003e), \u003cspan class=\"pl-s1\"\u003ewriter\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003egetValue\u003c/span\u003e()),\n () -\u0026gt; \u003cspan class=\"pl-en\"\u003eassertEquals\u003c/span\u003e(\u003cspan class=\"pl-en\"\u003elistOf\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"add 5\"\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e\"plus 2\"\u003c/span\u003e), \u003cspan class=\"pl-s1\"\u003ewriter\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003egetLog\u003c/span\u003e()));\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eIO Monad\u003c/h3\u003e\u003ca id=\"user-content-io-monad\" class=\"anchor\" aria-label=\"Permalink: IO Monad\" href=\"#io-monad\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis is a experimental implementation of IO Monad in java. Inspired in this \u003ca href=\"https://gist.github.com/joergrathlev/f17092d3470dcf732be6\"\u003ework\u003c/a\u003e.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"IO\u0026lt;Unit\u0026gt; echo = Console.print(\u0026quot;write your name\u0026quot;)\n .andThen(Console.read())\n .flatMap(name -\u0026gt; Console.print(\u0026quot;Hello \u0026quot; + name))\n .andThen(Console.print(\u0026quot;end\u0026quot;));\n\necho.unsafeRunSync();\"\u003e\u003cpre\u003e\u003cspan class=\"pl-smi\"\u003eIO\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eUnit\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003eecho\u003c/span\u003e = \u003cspan class=\"pl-smi\"\u003eConsole\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eprint\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"write your name\"\u003c/span\u003e)\n .\u003cspan class=\"pl-en\"\u003eandThen\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eConsole\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eread\u003c/span\u003e())\n .\u003cspan class=\"pl-en\"\u003eflatMap\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003ename\u003c/span\u003e -\u0026gt; \u003cspan class=\"pl-smi\"\u003eConsole\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eprint\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"Hello \"\u003c/span\u003e + \u003cspan class=\"pl-s1\"\u003ename\u003c/span\u003e))\n .\u003cspan class=\"pl-en\"\u003eandThen\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eConsole\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eprint\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"end\"\u003c/span\u003e));\n\n\u003cspan class=\"pl-s1\"\u003eecho\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eunsafeRunSync\u003c/span\u003e();\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eFree\u003c/h2\u003e\u003ca id=\"user-content-free\" class=\"anchor\" aria-label=\"Permalink: Free\" href=\"#free\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eFree Monad\u003c/h3\u003e\u003ca id=\"user-content-free-monad\" class=\"anchor\" aria-label=\"Permalink: Free Monad\" href=\"#free-monad\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eFinally, after hours of hard coding, I managed to implement a Free monad. This is a highly\nunstable implementation and I have implemented because it can be implemented. Inspired\nin this \u003ca href=\"https://github.com/xuwei-k/free-monad-java\"\u003ework\u003c/a\u003e.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"Free\u0026lt;IOProgram_, Unit\u0026gt; echo =\n IOProgram.write(\u0026quot;what's your name?\u0026quot;)\n .andThen(IOProgram.read())\n .flatMap(text -\u0026gt; IOProgram.write(\u0026quot;Hello \u0026quot; + text))\n .andThen(IOProgram.write(\u0026quot;end\u0026quot;));\n\nKind\u0026lt;IO_, Unit\u0026gt; foldMap = echo.foldMap(IOInstances.monad(), new IOProgramInterperter());\n\nfoldMap.fix(toIO()).unsafeRunSync();\"\u003e\u003cpre\u003e\u003cspan class=\"pl-smi\"\u003eFree\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eIOProgram_\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eUnit\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003eecho\u003c/span\u003e =\n \u003cspan class=\"pl-smi\"\u003eIOProgram\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003ewrite\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"what's your name?\"\u003c/span\u003e)\n .\u003cspan class=\"pl-en\"\u003eandThen\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eIOProgram\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eread\u003c/span\u003e())\n .\u003cspan class=\"pl-en\"\u003eflatMap\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003etext\u003c/span\u003e -\u0026gt; \u003cspan class=\"pl-smi\"\u003eIOProgram\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003ewrite\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"Hello \"\u003c/span\u003e + \u003cspan class=\"pl-s1\"\u003etext\u003c/span\u003e))\n .\u003cspan class=\"pl-en\"\u003eandThen\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eIOProgram\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003ewrite\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"end\"\u003c/span\u003e));\n\n\u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eIO_\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eUnit\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003efoldMap\u003c/span\u003e = \u003cspan class=\"pl-s1\"\u003eecho\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003efoldMap\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eIOInstances\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003emonad\u003c/span\u003e(), \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eIOProgramInterperter\u003c/span\u003e());\n\n\u003cspan class=\"pl-s1\"\u003efoldMap\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003efix\u003c/span\u003e(\u003cspan class=\"pl-en\"\u003etoIO\u003c/span\u003e()).\u003cspan class=\"pl-en\"\u003eunsafeRunSync\u003c/span\u003e();\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eFree Applicative\u003c/h3\u003e\u003ca id=\"user-content-free-applicative\" class=\"anchor\" aria-label=\"Permalink: Free Applicative\" href=\"#free-applicative\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eSimilar to Free monad, but allows static analysis without to run the program.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"FreeAp\u0026lt;DSL_, Tuple5\u0026lt;Integer, Boolean, Double, String, Unit\u0026gt;\u0026gt; tuple =\n applicative.map5(\n DSL.readInt(2),\n DSL.readBoolean(false),\n DSL.readDouble(2.1),\n DSL.readString(\u0026quot;hola mundo\u0026quot;),\n DSL.readUnit(),\n Tuple::of\n ).fix(toFreeAp());\n\nKind\u0026lt;Id_, Tuple5\u0026lt;Integer, Boolean, Double, String, Unit\u0026gt;\u0026gt; map =\n tuple.foldMap(idTransform(), IdInstances.applicative());\n\nassertEquals(Id.of(Tuple.of(2, false, 2.1, \u0026quot;hola mundo\u0026quot;, unit())), map.fix(toId()));\"\u003e\u003cpre\u003e\u003cspan class=\"pl-smi\"\u003eFreeAp\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eDSL_\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eTuple5\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eInteger\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eBoolean\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eDouble\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eUnit\u003c/span\u003e\u0026gt;\u0026gt; \u003cspan class=\"pl-s1\"\u003etuple\u003c/span\u003e =\n \u003cspan class=\"pl-s1\"\u003eapplicative\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003emap5\u003c/span\u003e(\n \u003cspan class=\"pl-c1\"\u003eDSL\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003ereadInt\u003c/span\u003e(\u003cspan class=\"pl-c1\"\u003e2\u003c/span\u003e),\n \u003cspan class=\"pl-c1\"\u003eDSL\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003ereadBoolean\u003c/span\u003e(\u003cspan class=\"pl-c1\"\u003efalse\u003c/span\u003e),\n \u003cspan class=\"pl-c1\"\u003eDSL\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003ereadDouble\u003c/span\u003e(\u003cspan class=\"pl-c1\"\u003e2.1\u003c/span\u003e),\n \u003cspan class=\"pl-c1\"\u003eDSL\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003ereadString\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"hola mundo\"\u003c/span\u003e),\n \u003cspan class=\"pl-c1\"\u003eDSL\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003ereadUnit\u003c/span\u003e(),\n \u003cspan class=\"pl-smi\"\u003eTuple\u003c/span\u003e::\u003cspan class=\"pl-s1\"\u003eof\u003c/span\u003e\n ).\u003cspan class=\"pl-en\"\u003efix\u003c/span\u003e(\u003cspan class=\"pl-en\"\u003etoFreeAp\u003c/span\u003e());\n\n\u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eId_\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eTuple5\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eInteger\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eBoolean\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eDouble\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eUnit\u003c/span\u003e\u0026gt;\u0026gt; \u003cspan class=\"pl-s1\"\u003emap\u003c/span\u003e =\n \u003cspan class=\"pl-s1\"\u003etuple\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003efoldMap\u003c/span\u003e(\u003cspan class=\"pl-en\"\u003eidTransform\u003c/span\u003e(), \u003cspan class=\"pl-smi\"\u003eIdInstances\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eapplicative\u003c/span\u003e());\n\n\u003cspan class=\"pl-en\"\u003eassertEquals\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eId\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eof\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eTuple\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eof\u003c/span\u003e(\u003cspan class=\"pl-c1\"\u003e2\u003c/span\u003e, \u003cspan class=\"pl-c1\"\u003efalse\u003c/span\u003e, \u003cspan class=\"pl-c1\"\u003e2.1\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e\"hola mundo\"\u003c/span\u003e, \u003cspan class=\"pl-en\"\u003eunit\u003c/span\u003e())), \u003cspan class=\"pl-s1\"\u003emap\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003efix\u003c/span\u003e(\u003cspan class=\"pl-en\"\u003etoId\u003c/span\u003e()));\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eMonad Transformers\u003c/h2\u003e\u003ca id=\"user-content-monad-transformers\" class=\"anchor\" aria-label=\"Permalink: Monad Transformers\" href=\"#monad-transformers\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eOptionT\u003c/h3\u003e\u003ca id=\"user-content-optiont\" class=\"anchor\" aria-label=\"Permalink: OptionT\" href=\"#optiont\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eMonad Transformer for \u003ccode\u003eOption\u003c/code\u003e type\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"OptionT\u0026lt;IO_, String\u0026gt; some = OptionT.some(IO.monad(), \u0026quot;abc\u0026quot;);\n\nOptionT\u0026lt;IO_, String\u0026gt; map = some.flatMap(value -\u0026gt; OptionT.some(IOInstances.monad(), value.toUpperCase()));\n\nassertEquals(\u0026quot;ABC\u0026quot;, map.get().fix(toIO()).unsafeRunSync());\"\u003e\u003cpre\u003e\u003cspan class=\"pl-smi\"\u003eOptionT\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eIO_\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003esome\u003c/span\u003e = \u003cspan class=\"pl-smi\"\u003eOptionT\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003esome\u003c/span\u003e(\u003cspan class=\"pl-c1\"\u003eIO\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003emonad\u003c/span\u003e(), \u003cspan class=\"pl-s\"\u003e\"abc\"\u003c/span\u003e);\n\n\u003cspan class=\"pl-smi\"\u003eOptionT\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eIO_\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003emap\u003c/span\u003e = \u003cspan class=\"pl-s1\"\u003esome\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eflatMap\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e -\u0026gt; \u003cspan class=\"pl-smi\"\u003eOptionT\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003esome\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eIOInstances\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003emonad\u003c/span\u003e(), \u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003etoUpperCase\u003c/span\u003e()));\n\n\u003cspan class=\"pl-en\"\u003eassertEquals\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"ABC\"\u003c/span\u003e, \u003cspan class=\"pl-s1\"\u003emap\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eget\u003c/span\u003e().\u003cspan class=\"pl-en\"\u003efix\u003c/span\u003e(\u003cspan class=\"pl-en\"\u003etoIO\u003c/span\u003e()).\u003cspan class=\"pl-en\"\u003eunsafeRunSync\u003c/span\u003e());\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eEitherT\u003c/h3\u003e\u003ca id=\"user-content-eithert\" class=\"anchor\" aria-label=\"Permalink: EitherT\" href=\"#eithert\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eMonad Transformer for \u003ccode\u003eEither\u003c/code\u003e type\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"EitherT\u0026lt;IO_, Nothing, String\u0026gt; right = EitherT.right(IO.monad(), \u0026quot;abc\u0026quot;);\n\nEitherT\u0026lt;IO_, Nothing, String\u0026gt; map = right.flatMap(value -\u0026gt; EitherT.right(IOInstances.monad(), value.toUpperCase()));\n\nassertEquals(\u0026quot;ABC\u0026quot;, map.get().fix(toIO()).unsafeRunSync());\"\u003e\u003cpre\u003e\u003cspan class=\"pl-smi\"\u003eEitherT\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eIO_\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eNothing\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003eright\u003c/span\u003e = \u003cspan class=\"pl-smi\"\u003eEitherT\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eright\u003c/span\u003e(\u003cspan class=\"pl-c1\"\u003eIO\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003emonad\u003c/span\u003e(), \u003cspan class=\"pl-s\"\u003e\"abc\"\u003c/span\u003e);\n\n\u003cspan class=\"pl-smi\"\u003eEitherT\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eIO_\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eNothing\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003emap\u003c/span\u003e = \u003cspan class=\"pl-s1\"\u003eright\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eflatMap\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e -\u0026gt; \u003cspan class=\"pl-smi\"\u003eEitherT\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eright\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eIOInstances\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003emonad\u003c/span\u003e(), \u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003etoUpperCase\u003c/span\u003e()));\n\n\u003cspan class=\"pl-en\"\u003eassertEquals\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"ABC\"\u003c/span\u003e, \u003cspan class=\"pl-s1\"\u003emap\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eget\u003c/span\u003e().\u003cspan class=\"pl-en\"\u003efix\u003c/span\u003e(\u003cspan class=\"pl-en\"\u003etoIO\u003c/span\u003e()).\u003cspan class=\"pl-en\"\u003eunsafeRunSync\u003c/span\u003e());\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eStateT\u003c/h3\u003e\u003ca id=\"user-content-statet\" class=\"anchor\" aria-label=\"Permalink: StateT\" href=\"#statet\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eMonad Transformer for \u003ccode\u003eState\u003c/code\u003e type\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"StateT\u0026lt;IO_, ImmutableList\u0026lt;String\u0026gt;, Unit\u0026gt; state =\n pure(\u0026quot;a\u0026quot;).flatMap(append(\u0026quot;b\u0026quot;)).flatMap(append(\u0026quot;c\u0026quot;)).flatMap(end());\n\nIO\u0026lt;Tuple2\u0026lt;ImmutableList\u0026lt;String\u0026gt;, Unit\u0026gt;\u0026gt; result = state.run(ImmutableList.empty()).fix(toIO());\n\nassertEquals(Tuple.of(listOf(\u0026quot;a\u0026quot;, \u0026quot;b\u0026quot;, \u0026quot;c\u0026quot;), unit()), result.unsafeRunSync());\"\u003e\u003cpre\u003e\u003cspan class=\"pl-smi\"\u003eStateT\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eIO_\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eImmutableList\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e\u0026gt;, \u003cspan class=\"pl-smi\"\u003eUnit\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003estate\u003c/span\u003e =\n \u003cspan class=\"pl-en\"\u003epure\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"a\"\u003c/span\u003e).\u003cspan class=\"pl-en\"\u003eflatMap\u003c/span\u003e(\u003cspan class=\"pl-en\"\u003eappend\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"b\"\u003c/span\u003e)).\u003cspan class=\"pl-en\"\u003eflatMap\u003c/span\u003e(\u003cspan class=\"pl-en\"\u003eappend\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"c\"\u003c/span\u003e)).\u003cspan class=\"pl-en\"\u003eflatMap\u003c/span\u003e(\u003cspan class=\"pl-en\"\u003eend\u003c/span\u003e());\n\n\u003cspan class=\"pl-smi\"\u003eIO\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eTuple2\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eImmutableList\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e\u0026gt;, \u003cspan class=\"pl-smi\"\u003eUnit\u003c/span\u003e\u0026gt;\u0026gt; \u003cspan class=\"pl-s1\"\u003eresult\u003c/span\u003e = \u003cspan class=\"pl-s1\"\u003estate\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003erun\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eImmutableList\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eempty\u003c/span\u003e()).\u003cspan class=\"pl-en\"\u003efix\u003c/span\u003e(\u003cspan class=\"pl-en\"\u003etoIO\u003c/span\u003e());\n\n\u003cspan class=\"pl-en\"\u003eassertEquals\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eTuple\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eof\u003c/span\u003e(\u003cspan class=\"pl-en\"\u003elistOf\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"a\"\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e\"b\"\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e\"c\"\u003c/span\u003e), \u003cspan class=\"pl-en\"\u003eunit\u003c/span\u003e()), \u003cspan class=\"pl-s1\"\u003eresult\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eunsafeRunSync\u003c/span\u003e());\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eWriterT\u003c/h3\u003e\u003ca id=\"user-content-writert\" class=\"anchor\" aria-label=\"Permalink: WriterT\" href=\"#writert\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eMonad Transformer for \u003ccode\u003eWriter\u003c/code\u003e type\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"WriterT\u0026lt;Id_, Sequence\u0026lt;String\u0026gt;, Integer\u0026gt; writer =\n WriterT.\u0026lt;Id_, Sequence\u0026lt;String\u0026gt;, Integer\u0026gt;pure(monoid, monad, 5)\n .flatMap(value -\u0026gt; lift(monoid, monad, Tuple.of(listOf(\u0026quot;add 5\u0026quot;), value + 5)))\n .flatMap(value -\u0026gt; lift(monoid, monad, Tuple.of(listOf(\u0026quot;plus 2\u0026quot;), value * 2)));\n\nassertAll(() -\u0026gt; assertEquals(Id.of(Integer.valueOf(20)), writer.getValue()),\n () -\u0026gt; assertEquals(Id.of(listOf(\u0026quot;add 5\u0026quot;, \u0026quot;plus 2\u0026quot;)), writer.getLog()));\"\u003e\u003cpre\u003e\u003cspan class=\"pl-smi\"\u003eWriterT\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eId_\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eSequence\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e\u0026gt;, \u003cspan class=\"pl-smi\"\u003eInteger\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003ewriter\u003c/span\u003e =\n \u003cspan class=\"pl-smi\"\u003eWriterT\u003c/span\u003e.\u0026lt;\u003cspan class=\"pl-smi\"\u003eId_\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eSequence\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e\u0026gt;, \u003cspan class=\"pl-smi\"\u003eInteger\u003c/span\u003e\u0026gt;\u003cspan class=\"pl-en\"\u003epure\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003emonoid\u003c/span\u003e, \u003cspan class=\"pl-s1\"\u003emonad\u003c/span\u003e, \u003cspan class=\"pl-c1\"\u003e5\u003c/span\u003e)\n .\u003cspan class=\"pl-en\"\u003eflatMap\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e -\u0026gt; \u003cspan class=\"pl-en\"\u003elift\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003emonoid\u003c/span\u003e, \u003cspan class=\"pl-s1\"\u003emonad\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eTuple\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eof\u003c/span\u003e(\u003cspan class=\"pl-en\"\u003elistOf\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"add 5\"\u003c/span\u003e), \u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e + \u003cspan class=\"pl-c1\"\u003e5\u003c/span\u003e)))\n .\u003cspan class=\"pl-en\"\u003eflatMap\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e -\u0026gt; \u003cspan class=\"pl-en\"\u003elift\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003emonoid\u003c/span\u003e, \u003cspan class=\"pl-s1\"\u003emonad\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eTuple\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eof\u003c/span\u003e(\u003cspan class=\"pl-en\"\u003elistOf\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"plus 2\"\u003c/span\u003e), \u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e * \u003cspan class=\"pl-c1\"\u003e2\u003c/span\u003e)));\n\n\u003cspan class=\"pl-en\"\u003eassertAll\u003c/span\u003e(() -\u0026gt; \u003cspan class=\"pl-en\"\u003eassertEquals\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eId\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eof\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eInteger\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003evalueOf\u003c/span\u003e(\u003cspan class=\"pl-c1\"\u003e20\u003c/span\u003e)), \u003cspan class=\"pl-s1\"\u003ewriter\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003egetValue\u003c/span\u003e()),\n () -\u0026gt; \u003cspan class=\"pl-en\"\u003eassertEquals\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eId\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eof\u003c/span\u003e(\u003cspan class=\"pl-en\"\u003elistOf\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"add 5\"\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e\"plus 2\"\u003c/span\u003e)), \u003cspan class=\"pl-s1\"\u003ewriter\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003egetLog\u003c/span\u003e()));\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eKleisli\u003c/h3\u003e\u003ca id=\"user-content-kleisli\" class=\"anchor\" aria-label=\"Permalink: Kleisli\" href=\"#kleisli\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eAlso I implemented the Kleisli composition for functions that returns monadic values like \u003ccode\u003eOption\u003c/code\u003e, \u003ccode\u003eTry\u003c/code\u003e or \u003ccode\u003eEither\u003c/code\u003e.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"Kleisli\u0026lt;Try_, String, Integer\u0026gt; toInt = Kleisli.lift(Try.monad(), Integer::parseInt);\nKleisli\u0026lt;Try_, Integer, Double\u0026gt; half = Kleisli.lift(Try.monad(), i -\u0026gt; i / 2.);\n\nKind\u0026lt;Try_, Double\u0026gt; result = toInt.compose(half).run(\u0026quot;123\u0026quot;);\n\nassertEquals(Try.success(61.5), result);\"\u003e\u003cpre\u003e\u003cspan class=\"pl-smi\"\u003eKleisli\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eTry_\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eInteger\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003etoInt\u003c/span\u003e = \u003cspan class=\"pl-smi\"\u003eKleisli\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003elift\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eTry\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003emonad\u003c/span\u003e(), \u003cspan class=\"pl-smi\"\u003eInteger\u003c/span\u003e::\u003cspan class=\"pl-s1\"\u003eparseInt\u003c/span\u003e);\n\u003cspan class=\"pl-smi\"\u003eKleisli\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eTry_\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eInteger\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eDouble\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003ehalf\u003c/span\u003e = \u003cspan class=\"pl-smi\"\u003eKleisli\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003elift\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eTry\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003emonad\u003c/span\u003e(), \u003cspan class=\"pl-s1\"\u003ei\u003c/span\u003e -\u0026gt; \u003cspan class=\"pl-s1\"\u003ei\u003c/span\u003e / \u003cspan class=\"pl-c1\"\u003e2.\u003c/span\u003e);\n\n\u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eTry_\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eDouble\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003eresult\u003c/span\u003e = \u003cspan class=\"pl-s1\"\u003etoInt\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003ecompose\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003ehalf\u003c/span\u003e).\u003cspan class=\"pl-en\"\u003erun\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"123\"\u003c/span\u003e);\n\n\u003cspan class=\"pl-en\"\u003eassertEquals\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eTry\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003esuccess\u003c/span\u003e(\u003cspan class=\"pl-c1\"\u003e61.5\u003c/span\u003e), \u003cspan class=\"pl-s1\"\u003eresult\u003c/span\u003e);\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eStream\u003c/h2\u003e\u003ca id=\"user-content-stream\" class=\"anchor\" aria-label=\"Permalink: Stream\" href=\"#stream\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eAn experimental version of a \u003ccode\u003eStream\u003c/code\u003e like scala fs2 project.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"StreamOf\u0026lt;IO\u0026lt;?\u0026gt;\u0026gt; streamOfIO = Stream.ofIO();\n\nIO\u0026lt;String\u0026gt; readFile = streamOfIO.eval(IO.of(() -\u0026gt; reader(file)))\n .flatMap(reader -\u0026gt; streamOfIO.iterate(() -\u0026gt; Option.of(() -\u0026gt; readLine(reader))))\n .takeWhile(Option::isPresent)\n .map(Option::get)\n .foldLeft(\u0026quot;\u0026quot;, (a, b) -\u0026gt; a + \u0026quot;\\n\u0026quot; + b)\n .fix(IOOf::toIO)\n .recoverWith(UncheckedIOException.class, cons(\u0026quot;--- file not found ---\u0026quot;));\n\nString content = readFile.unsafeRunSync();\"\u003e\u003cpre\u003e\u003cspan class=\"pl-smi\"\u003eStreamOf\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eIO\u003c/span\u003e\u0026lt;?\u0026gt;\u0026gt; \u003cspan class=\"pl-s1\"\u003estreamOfIO\u003c/span\u003e = \u003cspan class=\"pl-smi\"\u003eStream\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eofIO\u003c/span\u003e();\n\n\u003cspan class=\"pl-smi\"\u003eIO\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003ereadFile\u003c/span\u003e = \u003cspan class=\"pl-s1\"\u003estreamOfIO\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eeval\u003c/span\u003e(\u003cspan class=\"pl-c1\"\u003eIO\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eof\u003c/span\u003e(() -\u0026gt; \u003cspan class=\"pl-en\"\u003ereader\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003efile\u003c/span\u003e)))\n .\u003cspan class=\"pl-en\"\u003eflatMap\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003ereader\u003c/span\u003e -\u0026gt; \u003cspan class=\"pl-s1\"\u003estreamOfIO\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eiterate\u003c/span\u003e(() -\u0026gt; \u003cspan class=\"pl-smi\"\u003eOption\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eof\u003c/span\u003e(() -\u0026gt; \u003cspan class=\"pl-en\"\u003ereadLine\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003ereader\u003c/span\u003e))))\n .\u003cspan class=\"pl-en\"\u003etakeWhile\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eOption\u003c/span\u003e::\u003cspan class=\"pl-s1\"\u003eisPresent\u003c/span\u003e)\n .\u003cspan class=\"pl-en\"\u003emap\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eOption\u003c/span\u003e::\u003cspan class=\"pl-s1\"\u003eget\u003c/span\u003e)\n .\u003cspan class=\"pl-en\"\u003efoldLeft\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"\"\u003c/span\u003e, (\u003cspan class=\"pl-s1\"\u003ea\u003c/span\u003e, \u003cspan class=\"pl-s1\"\u003eb\u003c/span\u003e) -\u0026gt; \u003cspan class=\"pl-s1\"\u003ea\u003c/span\u003e + \u003cspan class=\"pl-s\"\u003e\"\u003cspan class=\"pl-cce\"\u003e\\n\u003c/span\u003e\"\u003c/span\u003e + \u003cspan class=\"pl-s1\"\u003eb\u003c/span\u003e)\n .\u003cspan class=\"pl-en\"\u003efix\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eIOOf\u003c/span\u003e::\u003cspan class=\"pl-s1\"\u003etoIO\u003c/span\u003e)\n .\u003cspan class=\"pl-en\"\u003erecoverWith\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eUncheckedIOException\u003c/span\u003e.\u003cspan class=\"pl-k\"\u003eclass\u003c/span\u003e, \u003cspan class=\"pl-en\"\u003econs\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"--- file not found ---\"\u003c/span\u003e));\n\n\u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003econtent\u003c/span\u003e = \u003cspan class=\"pl-s1\"\u003ereadFile\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eunsafeRunSync\u003c/span\u003e();\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eEffects\u003c/h2\u003e\u003ca id=\"user-content-effects\" class=\"anchor\" aria-label=\"Permalink: Effects\" href=\"#effects\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eAn experimental version of \u003ccode\u003ePureIO\u003c/code\u003e similar to ZIO.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"PureIO\u0026lt;Console, Throwable, Unit\u0026gt; echoProgram =\n Console.println(\u0026quot;what's your name?\u0026quot;)\n .andThen(Console.readln())\n .flatMap(name -\u0026gt; Console.println(\u0026quot;Hello \u0026quot; + name));\n\ninterface Console {\n\n \u0026lt;R extends Console\u0026gt; Console.Service\u0026lt;R\u0026gt; console();\n\n static PureIO\u0026lt;Console, Throwable, String\u0026gt; readln() {\n return PureIO.accessM(env -\u0026gt; env.console().readln());\n }\n\n static PureIO\u0026lt;Console, Throwable, Unit\u0026gt; println(String text) {\n return PureIO.accessM(env -\u0026gt; env.console().println(text));\n }\n\n interface Service\u0026lt;R extends Console\u0026gt; {\n PureIO\u0026lt;R, Throwable, String\u0026gt; readln();\n\n PureIO\u0026lt;R, Throwable, Unit\u0026gt; println(String text);\n }\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-smi\"\u003ePureIO\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eConsole\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eThrowable\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eUnit\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003eechoProgram\u003c/span\u003e =\n \u003cspan class=\"pl-smi\"\u003eConsole\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eprintln\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"what's your name?\"\u003c/span\u003e)\n .\u003cspan class=\"pl-en\"\u003eandThen\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eConsole\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003ereadln\u003c/span\u003e())\n .\u003cspan class=\"pl-en\"\u003eflatMap\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003ename\u003c/span\u003e -\u0026gt; \u003cspan class=\"pl-smi\"\u003eConsole\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eprintln\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"Hello \"\u003c/span\u003e + \u003cspan class=\"pl-s1\"\u003ename\u003c/span\u003e));\n\n\u003cspan class=\"pl-k\"\u003einterface\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eConsole\u003c/span\u003e {\n\n \u0026lt;\u003cspan class=\"pl-smi\"\u003eR\u003c/span\u003e \u003cspan class=\"pl-k\"\u003eextends\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eConsole\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-smi\"\u003eConsole\u003c/span\u003e.\u003cspan class=\"pl-smi\"\u003eService\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eR\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-en\"\u003econsole\u003c/span\u003e();\n\n \u003cspan class=\"pl-k\"\u003estatic\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003ePureIO\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eConsole\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eThrowable\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-en\"\u003ereadln\u003c/span\u003e() {\n \u003cspan class=\"pl-k\"\u003ereturn\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003ePureIO\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eaccessM\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003eenv\u003c/span\u003e -\u0026gt; \u003cspan class=\"pl-s1\"\u003eenv\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003econsole\u003c/span\u003e().\u003cspan class=\"pl-en\"\u003ereadln\u003c/span\u003e());\n }\n\n \u003cspan class=\"pl-k\"\u003estatic\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003ePureIO\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eConsole\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eThrowable\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eUnit\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-en\"\u003eprintln\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003etext\u003c/span\u003e) {\n \u003cspan class=\"pl-k\"\u003ereturn\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003ePureIO\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eaccessM\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003eenv\u003c/span\u003e -\u0026gt; \u003cspan class=\"pl-s1\"\u003eenv\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003econsole\u003c/span\u003e().\u003cspan class=\"pl-en\"\u003eprintln\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003etext\u003c/span\u003e));\n }\n\n \u003cspan class=\"pl-k\"\u003einterface\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eService\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eR\u003c/span\u003e \u003cspan class=\"pl-k\"\u003eextends\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eConsole\u003c/span\u003e\u0026gt; {\n \u003cspan class=\"pl-smi\"\u003ePureIO\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eR\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eThrowable\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-en\"\u003ereadln\u003c/span\u003e();\n\n \u003cspan class=\"pl-smi\"\u003ePureIO\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eR\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eThrowable\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eUnit\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-en\"\u003eprintln\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003etext\u003c/span\u003e);\n }\n}\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eAdditionally, there are aliases for some PureIO special cases:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"UIO\u0026lt;T\u0026gt; =\u0026gt; PureIO\u0026lt;Void, Void, T\u0026gt;\nEIO\u0026lt;E, T\u0026gt; =\u0026gt; PureIO\u0026lt;Void, E, T\u0026gt;\nTask\u0026lt;T\u0026gt; =\u0026gt; PureIO\u0026lt;Void, Throwable, T\u0026gt;\nRIO\u0026lt;R, T\u0026gt; =\u0026gt; PureIO\u0026lt;R, Throwable, T\u0026gt;\nURIO\u0026lt;T\u0026gt; =\u0026gt; PureIO\u0026lt;R, Void, T\u0026gt;\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003eUIO\u0026lt;T\u0026gt; =\u0026gt; PureIO\u0026lt;Void, Void, T\u0026gt;\nEIO\u0026lt;E, T\u0026gt; =\u0026gt; PureIO\u0026lt;Void, E, T\u0026gt;\nTask\u0026lt;T\u0026gt; =\u0026gt; PureIO\u0026lt;Void, Throwable, T\u0026gt;\nRIO\u0026lt;R, T\u0026gt; =\u0026gt; PureIO\u0026lt;R, Throwable, T\u0026gt;\nURIO\u0026lt;T\u0026gt; =\u0026gt; PureIO\u0026lt;R, Void, T\u0026gt;\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eType Classes\u003c/h2\u003e\u003ca id=\"user-content-type-classes\" class=\"anchor\" aria-label=\"Permalink: Type Classes\" href=\"#type-classes\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eWith higher kinded types simulation we can implement typeclases.\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\" Invariant -- Contravariant\n \\\n SemigroupK Functor -- Comonad\n | / \\\n MonoidK _ Applicative Traverse -- Foldable\n | / | \\\n Alternative Selective ApplicativeError\n | |\n MonadWriter Monad |\n \\________________| |\n / / \\ / \n MonadState MonadReader MonadError_____\n \\ \\\n MonadThrow Bracket\n \\ /\n Defer -- MonadDefer -- Timer\n |\n Async\n |\n Concurrent\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003e Invariant -- Contravariant\n \\\n SemigroupK Functor -- Comonad\n | / \\\n MonoidK _ Applicative Traverse -- Foldable\n | / | \\\n Alternative Selective ApplicativeError\n | |\n MonadWriter Monad |\n \\________________| |\n / / \\ / \n MonadState MonadReader MonadError_____\n \\ \\\n MonadThrow Bracket\n \\ /\n Defer -- MonadDefer -- Timer\n |\n Async\n |\n Concurrent\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eFunctor\u003c/h3\u003e\u003ca id=\"user-content-functor\" class=\"anchor\" aria-label=\"Permalink: Functor\" href=\"#functor\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"public interface Functor\u0026lt;F extends \u0026gt; extends Invariant\u0026lt;F\u0026gt; {\n\n \u0026lt;T, R\u0026gt; Kind\u0026lt;F, R\u0026gt; map(Kind\u0026lt;F, T\u0026gt; value, Function1\u0026lt;T, R\u0026gt; map);\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003epublic\u003c/span\u003e \u003cspan class=\"pl-k\"\u003einterface\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eFunctor\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e \u003cspan class=\"pl-k\"\u003eextends\u003c/span\u003e \u0026gt; \u003cspan class=\"pl-k\"\u003eextends\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eInvariant\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e\u0026gt; {\n\n \u0026lt;\u003cspan class=\"pl-smi\"\u003eT\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eR\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eR\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-en\"\u003emap\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eT\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eFunction1\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eT\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eR\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003emap\u003c/span\u003e);\n}\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eApplicative\u003c/h3\u003e\u003ca id=\"user-content-applicative\" class=\"anchor\" aria-label=\"Permalink: Applicative\" href=\"#applicative\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"public interface Applicative\u0026lt;F\u0026gt; extends Functor\u0026lt;F\u0026gt; {\n\n \u0026lt;T\u0026gt; Kind\u0026lt;F, T\u0026gt; pure(T value);\n\n \u0026lt;T, R\u0026gt; Kind\u0026lt;F, R\u0026gt; ap(Kind\u0026lt;F, T\u0026gt; value, Kind\u0026lt;F, Function1\u0026lt;T, R\u0026gt;\u0026gt; apply);\n\n @Override\n default \u0026lt;T, R\u0026gt; Kind\u0026lt;F, R\u0026gt; map(Kind\u0026lt;F, T\u0026gt; value, Function1\u0026lt;T, R\u0026gt; map) {\n return ap(value, pure(map));\n }\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003epublic\u003c/span\u003e \u003cspan class=\"pl-k\"\u003einterface\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eApplicative\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-k\"\u003eextends\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eFunctor\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e\u0026gt; {\n\n \u0026lt;\u003cspan class=\"pl-smi\"\u003eT\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eT\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-en\"\u003epure\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eT\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e);\n\n \u0026lt;\u003cspan class=\"pl-smi\"\u003eT\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eR\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eR\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-en\"\u003eap\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eT\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eFunction1\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eT\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eR\u003c/span\u003e\u0026gt;\u0026gt; \u003cspan class=\"pl-s1\"\u003eapply\u003c/span\u003e);\n\n \u003cspan class=\"pl-c1\"\u003e@\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003eOverride\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003edefault\u003c/span\u003e \u0026lt;\u003cspan class=\"pl-smi\"\u003eT\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eR\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eR\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-en\"\u003emap\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eT\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eFunction1\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eT\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eR\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003emap\u003c/span\u003e) {\n \u003cspan class=\"pl-k\"\u003ereturn\u003c/span\u003e \u003cspan class=\"pl-en\"\u003eap\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e, \u003cspan class=\"pl-en\"\u003epure\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003emap\u003c/span\u003e));\n }\n}\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eSelective\u003c/h3\u003e\u003ca id=\"user-content-selective\" class=\"anchor\" aria-label=\"Permalink: Selective\" href=\"#selective\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"public interface Selective\u0026lt;F\u0026gt; extends Applicative\u0026lt;F\u0026gt; {\n\n \u0026lt;A, B\u0026gt; Kind\u0026lt;F, B\u0026gt; select(Kind\u0026lt;F, Either\u0026lt;A, B\u0026gt;\u0026gt; value, Kind\u0026lt;F, Function1\u0026lt;A, B\u0026gt;\u0026gt; apply);\n\n default \u0026lt;A, B, C\u0026gt; Kind\u0026lt;F, C\u0026gt; branch(Kind\u0026lt;F, Either\u0026lt;A, B\u0026gt;\u0026gt; value,\n Kind\u0026lt;F, Function1\u0026lt;A, C\u0026gt;\u0026gt; applyA,\n Kind\u0026lt;F, Function1\u0026lt;B, C\u0026gt;\u0026gt; applyB) {\n Kind\u0026lt;F, Either\u0026lt;A, Either\u0026lt;B, C\u0026gt;\u0026gt;\u0026gt; abc = map(value, either -\u0026gt; either.map(Either::left));\n Kind\u0026lt;F, Function1\u0026lt;A, Either\u0026lt;B, C\u0026gt;\u0026gt;\u0026gt; fabc = map(applyA, fb -\u0026gt; fb.andThen(Either::right));\n return select(select(abc, fabc), applyB);\n }\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003epublic\u003c/span\u003e \u003cspan class=\"pl-k\"\u003einterface\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eSelective\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-k\"\u003eextends\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eApplicative\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e\u0026gt; {\n\n \u0026lt;\u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eB\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eB\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-en\"\u003eselect\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eEither\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eB\u003c/span\u003e\u0026gt;\u0026gt; \u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eFunction1\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eB\u003c/span\u003e\u0026gt;\u0026gt; \u003cspan class=\"pl-s1\"\u003eapply\u003c/span\u003e);\n\n \u003cspan class=\"pl-k\"\u003edefault\u003c/span\u003e \u0026lt;\u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eB\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eC\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eC\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-en\"\u003ebranch\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eEither\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eB\u003c/span\u003e\u0026gt;\u0026gt; \u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e,\n \u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eFunction1\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eC\u003c/span\u003e\u0026gt;\u0026gt; \u003cspan class=\"pl-s1\"\u003eapplyA\u003c/span\u003e,\n \u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eFunction1\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eB\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eC\u003c/span\u003e\u0026gt;\u0026gt; \u003cspan class=\"pl-s1\"\u003eapplyB\u003c/span\u003e) {\n \u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eEither\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eEither\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eB\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eC\u003c/span\u003e\u0026gt;\u0026gt;\u0026gt; \u003cspan class=\"pl-s1\"\u003eabc\u003c/span\u003e = \u003cspan class=\"pl-en\"\u003emap\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e, \u003cspan class=\"pl-s1\"\u003eeither\u003c/span\u003e -\u0026gt; \u003cspan class=\"pl-s1\"\u003eeither\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003emap\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eEither\u003c/span\u003e::\u003cspan class=\"pl-s1\"\u003eleft\u003c/span\u003e));\n \u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eFunction1\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eEither\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eB\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eC\u003c/span\u003e\u0026gt;\u0026gt;\u0026gt; \u003cspan class=\"pl-s1\"\u003efabc\u003c/span\u003e = \u003cspan class=\"pl-en\"\u003emap\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003eapplyA\u003c/span\u003e, \u003cspan class=\"pl-s1\"\u003efb\u003c/span\u003e -\u0026gt; \u003cspan class=\"pl-s1\"\u003efb\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eandThen\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eEither\u003c/span\u003e::\u003cspan class=\"pl-s1\"\u003eright\u003c/span\u003e));\n \u003cspan class=\"pl-k\"\u003ereturn\u003c/span\u003e \u003cspan class=\"pl-en\"\u003eselect\u003c/span\u003e(\u003cspan class=\"pl-en\"\u003eselect\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003eabc\u003c/span\u003e, \u003cspan class=\"pl-s1\"\u003efabc\u003c/span\u003e), \u003cspan class=\"pl-s1\"\u003eapplyB\u003c/span\u003e);\n }\n}\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eMonad\u003c/h3\u003e\u003ca id=\"user-content-monad\" class=\"anchor\" aria-label=\"Permalink: Monad\" href=\"#monad\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"public interface Monad\u0026lt;F\u0026gt; extends Selective\u0026lt;F\u0026gt; {\n\n \u0026lt;T, R\u0026gt; Kind\u0026lt;F, R\u0026gt; flatMap(Kind\u0026lt;F, T\u0026gt; value, Function1\u0026lt;T, ? extends Kind\u0026lt;F, R\u0026gt;\u0026gt; map);\n\n @Override\n default \u0026lt;T, R\u0026gt; Kind\u0026lt;F, R\u0026gt; map(Kind\u0026lt;F, T\u0026gt; value, Function1\u0026lt;T, R\u0026gt; map) {\n return flatMap(value, map.andThen(this::pure));\n }\n\n @Override\n default \u0026lt;T, R\u0026gt; Kind\u0026lt;F, R\u0026gt; ap(Kind\u0026lt;F, T\u0026gt; value, Kind\u0026lt;F, Function1\u0026lt;T, R\u0026gt;\u0026gt; apply) {\n return flatMap(apply, map -\u0026gt; map(value, map));\n }\n\n @Override\n default \u0026lt;A, B\u0026gt; Kind\u0026lt;F, B\u0026gt; select(Kind\u0026lt;F, Either\u0026lt;A, B\u0026gt;\u0026gt; value, Kind\u0026lt;F, Function1\u0026lt;A, B\u0026gt;\u0026gt; apply) {\n return flatMap(value, either -\u0026gt; either.fold(a -\u0026gt; map(apply, map -\u0026gt; map.apply(a)), this::\u0026lt;B\u0026gt;pure));\n }\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003epublic\u003c/span\u003e \u003cspan class=\"pl-k\"\u003einterface\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eMonad\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-k\"\u003eextends\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eSelective\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e\u0026gt; {\n\n \u0026lt;\u003cspan class=\"pl-smi\"\u003eT\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eR\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eR\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-en\"\u003eflatMap\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eT\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eFunction1\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eT\u003c/span\u003e, ? \u003cspan class=\"pl-k\"\u003eextends\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eR\u003c/span\u003e\u0026gt;\u0026gt; \u003cspan class=\"pl-s1\"\u003emap\u003c/span\u003e);\n\n \u003cspan class=\"pl-c1\"\u003e@\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003eOverride\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003edefault\u003c/span\u003e \u0026lt;\u003cspan class=\"pl-smi\"\u003eT\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eR\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eR\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-en\"\u003emap\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eT\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eFunction1\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eT\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eR\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003emap\u003c/span\u003e) {\n \u003cspan class=\"pl-k\"\u003ereturn\u003c/span\u003e \u003cspan class=\"pl-en\"\u003eflatMap\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e, \u003cspan class=\"pl-s1\"\u003emap\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eandThen\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003ethis\u003c/span\u003e::\u003cspan class=\"pl-s1\"\u003epure\u003c/span\u003e));\n }\n\n \u003cspan class=\"pl-c1\"\u003e@\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003eOverride\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003edefault\u003c/span\u003e \u0026lt;\u003cspan class=\"pl-smi\"\u003eT\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eR\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eR\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-en\"\u003eap\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eT\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eFunction1\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eT\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eR\u003c/span\u003e\u0026gt;\u0026gt; \u003cspan class=\"pl-s1\"\u003eapply\u003c/span\u003e) {\n \u003cspan class=\"pl-k\"\u003ereturn\u003c/span\u003e \u003cspan class=\"pl-en\"\u003eflatMap\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003eapply\u003c/span\u003e, \u003cspan class=\"pl-s1\"\u003emap\u003c/span\u003e -\u0026gt; \u003cspan class=\"pl-en\"\u003emap\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e, \u003cspan class=\"pl-s1\"\u003emap\u003c/span\u003e));\n }\n\n \u003cspan class=\"pl-c1\"\u003e@\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003eOverride\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003edefault\u003c/span\u003e \u0026lt;\u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eB\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eB\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-en\"\u003eselect\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eEither\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eB\u003c/span\u003e\u0026gt;\u0026gt; \u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eFunction1\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eB\u003c/span\u003e\u0026gt;\u0026gt; \u003cspan class=\"pl-s1\"\u003eapply\u003c/span\u003e) {\n \u003cspan class=\"pl-k\"\u003ereturn\u003c/span\u003e \u003cspan class=\"pl-en\"\u003eflatMap\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e, \u003cspan class=\"pl-s1\"\u003eeither\u003c/span\u003e -\u0026gt; \u003cspan class=\"pl-s1\"\u003eeither\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003efold\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003ea\u003c/span\u003e -\u0026gt; \u003cspan class=\"pl-en\"\u003emap\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003eapply\u003c/span\u003e, \u003cspan class=\"pl-s1\"\u003emap\u003c/span\u003e -\u0026gt; \u003cspan class=\"pl-s1\"\u003emap\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eapply\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003ea\u003c/span\u003e)), \u003cspan class=\"pl-smi\"\u003ethis\u003c/span\u003e::\u0026lt;\u003cspan class=\"pl-smi\"\u003eB\u003c/span\u003e\u0026gt;\u003cspan class=\"pl-s1\"\u003epure\u003c/span\u003e));\n }\n}\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eSemigroup\u003c/h3\u003e\u003ca id=\"user-content-semigroup\" class=\"anchor\" aria-label=\"Permalink: Semigroup\" href=\"#semigroup\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIt represents a binary operation over a type.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"@FunctionalInterface\npublic interface Semigroup\u0026lt;T\u0026gt; {\n T combine(T t1, T t2);\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-c1\"\u003e@\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003eFunctionalInterface\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003epublic\u003c/span\u003e \u003cspan class=\"pl-k\"\u003einterface\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eSemigroup\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eT\u003c/span\u003e\u0026gt; {\n \u003cspan class=\"pl-smi\"\u003eT\u003c/span\u003e \u003cspan class=\"pl-en\"\u003ecombine\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eT\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003et1\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eT\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003et2\u003c/span\u003e);\n}\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThere are instances for strings and integers.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eMonoid\u003c/h3\u003e\u003ca id=\"user-content-monoid\" class=\"anchor\" aria-label=\"Permalink: Monoid\" href=\"#monoid\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eExtends \u003ccode\u003eSemigroup\u003c/code\u003e adding a \u003ccode\u003ezero\u003c/code\u003e operation that represent an identity.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"public interface Monoid\u0026lt;T\u0026gt; extends Semigroup\u0026lt;T\u0026gt; {\n T zero();\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003epublic\u003c/span\u003e \u003cspan class=\"pl-k\"\u003einterface\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eMonoid\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eT\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-k\"\u003eextends\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eSemigroup\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eT\u003c/span\u003e\u0026gt; {\n \u003cspan class=\"pl-smi\"\u003eT\u003c/span\u003e \u003cspan class=\"pl-en\"\u003ezero\u003c/span\u003e();\n}\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThere are instances for strings and integers.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eSemigroupK\u003c/h3\u003e\u003ca id=\"user-content-semigroupk\" class=\"anchor\" aria-label=\"Permalink: SemigroupK\" href=\"#semigroupk\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIt represents a \u003ccode\u003eSemigroup\u003c/code\u003e but defined for a kind, like a List, so it extends a regular \u003ccode\u003eSemigroup\u003c/code\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eMonoidK\u003c/h3\u003e\u003ca id=\"user-content-monoidk\" class=\"anchor\" aria-label=\"Permalink: MonoidK\" href=\"#monoidk\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe same like \u003ccode\u003eSemigroupK\u003c/code\u003e but for a \u003ccode\u003eMonoid\u003c/code\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eInvariant\u003c/h3\u003e\u003ca id=\"user-content-invariant\" class=\"anchor\" aria-label=\"Permalink: Invariant\" href=\"#invariant\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"public interface Invariant\u0026lt;F\u0026gt; {\n \u0026lt;A, B\u0026gt; Kind\u0026lt;F, B\u0026gt; imap(Kind\u0026lt;F, A\u0026gt; value, Function1\u0026lt;A, B\u0026gt; map, Function1\u0026lt;B, A\u0026gt; comap);\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003epublic\u003c/span\u003e \u003cspan class=\"pl-k\"\u003einterface\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eInvariant\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e\u0026gt; {\n \u0026lt;\u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eB\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eB\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-en\"\u003eimap\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eFunction1\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eB\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003emap\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eFunction1\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eB\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003ecomap\u003c/span\u003e);\n}\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eContravariant\u003c/h3\u003e\u003ca id=\"user-content-contravariant\" class=\"anchor\" aria-label=\"Permalink: Contravariant\" href=\"#contravariant\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"public interface Contravariant\u0026lt;F\u0026gt; extends Invariant\u0026lt;F\u0026gt; {\n \u0026lt;A, B\u0026gt; Kind\u0026lt;F, B\u0026gt; contramap(Kind\u0026lt;F, A\u0026gt; value, Function1\u0026lt;B, A\u0026gt; map);\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003epublic\u003c/span\u003e \u003cspan class=\"pl-k\"\u003einterface\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eContravariant\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-k\"\u003eextends\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eInvariant\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e\u0026gt; {\n \u0026lt;\u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eB\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eB\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-en\"\u003econtramap\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eFunction1\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eB\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003emap\u003c/span\u003e);\n}\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eApplicative Error\u003c/h3\u003e\u003ca id=\"user-content-applicative-error\" class=\"anchor\" aria-label=\"Permalink: Applicative Error\" href=\"#applicative-error\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"public interface ApplicativeError\u0026lt;F, E\u0026gt; extends Applicative\u0026lt;F\u0026gt; {\n\n \u0026lt;A\u0026gt; Kind\u0026lt;F, A\u0026gt; raiseError(E error);\n\n \u0026lt;A\u0026gt; Kind\u0026lt;F, A\u0026gt; handleErrorWith(Kind\u0026lt;F, A\u0026gt; value, Function1\u0026lt;E, ? extends Kind\u0026lt;F, A\u0026gt;\u0026gt; handler);\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003epublic\u003c/span\u003e \u003cspan class=\"pl-k\"\u003einterface\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eApplicativeError\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eE\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-k\"\u003eextends\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eApplicative\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e\u0026gt; {\n\n \u0026lt;\u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-en\"\u003eraiseError\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eE\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eerror\u003c/span\u003e);\n\n \u0026lt;\u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-en\"\u003ehandleErrorWith\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eFunction1\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eE\u003c/span\u003e, ? \u003cspan class=\"pl-k\"\u003eextends\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt;\u0026gt; \u003cspan class=\"pl-s1\"\u003ehandler\u003c/span\u003e);\n}\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eMonad Error\u003c/h3\u003e\u003ca id=\"user-content-monad-error\" class=\"anchor\" aria-label=\"Permalink: Monad Error\" href=\"#monad-error\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"public interface MonadError\u0026lt;F, E\u0026gt; extends ApplicativeError\u0026lt;F, E\u0026gt;, Monad\u0026lt;F\u0026gt; {\n\n default \u0026lt;A\u0026gt; Kind\u0026lt;F, A\u0026gt; ensure(Kind\u0026lt;F, A\u0026gt; value, Producer\u0026lt;E\u0026gt; error, Matcher1\u0026lt;A\u0026gt; matcher) {\n return flatMap(value, a -\u0026gt; matcher.match(a) ? pure(a) : raiseError(error.get()));\n }\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003epublic\u003c/span\u003e \u003cspan class=\"pl-k\"\u003einterface\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eMonadError\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eE\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-k\"\u003eextends\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eApplicativeError\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eE\u003c/span\u003e\u0026gt;, \u003cspan class=\"pl-smi\"\u003eMonad\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e\u0026gt; {\n\n \u003cspan class=\"pl-k\"\u003edefault\u003c/span\u003e \u0026lt;\u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-en\"\u003eensure\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eProducer\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eE\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003eerror\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eMatcher1\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003ematcher\u003c/span\u003e) {\n \u003cspan class=\"pl-k\"\u003ereturn\u003c/span\u003e \u003cspan class=\"pl-en\"\u003eflatMap\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e, \u003cspan class=\"pl-s1\"\u003ea\u003c/span\u003e -\u0026gt; \u003cspan class=\"pl-s1\"\u003ematcher\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003ematch\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003ea\u003c/span\u003e) ? \u003cspan class=\"pl-en\"\u003epure\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003ea\u003c/span\u003e) : \u003cspan class=\"pl-en\"\u003eraiseError\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003eerror\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eget\u003c/span\u003e()));\n }\n}\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eMonad Throw\u003c/h3\u003e\u003ca id=\"user-content-monad-throw\" class=\"anchor\" aria-label=\"Permalink: Monad Throw\" href=\"#monad-throw\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"public interface MonadThrow\u0026lt;F\u0026gt; extends MonadError\u0026lt;F, Throwable\u0026gt; {\n\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003epublic\u003c/span\u003e \u003cspan class=\"pl-k\"\u003einterface\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eMonadThrow\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-k\"\u003eextends\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eMonadError\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eThrowable\u003c/span\u003e\u0026gt; {\n\n}\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eMonadReader\u003c/h3\u003e\u003ca id=\"user-content-monadreader\" class=\"anchor\" aria-label=\"Permalink: MonadReader\" href=\"#monadreader\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"public interface MonadReader\u0026lt;F, R\u0026gt; extends Monad\u0026lt;F\u0026gt; {\n\n Kind\u0026lt;F, R\u0026gt; ask();\n\n default \u0026lt;A\u0026gt; Kind\u0026lt;F, A\u0026gt; reader(Function1\u0026lt;R, A\u0026gt; mapper) {\n return map(ask(), mapper);\n }\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003epublic\u003c/span\u003e \u003cspan class=\"pl-k\"\u003einterface\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eMonadReader\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eR\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-k\"\u003eextends\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eMonad\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e\u0026gt; {\n\n \u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eR\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-en\"\u003eask\u003c/span\u003e();\n\n \u003cspan class=\"pl-k\"\u003edefault\u003c/span\u003e \u0026lt;\u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-en\"\u003ereader\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eFunction1\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eR\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003emapper\u003c/span\u003e) {\n \u003cspan class=\"pl-k\"\u003ereturn\u003c/span\u003e \u003cspan class=\"pl-en\"\u003emap\u003c/span\u003e(\u003cspan class=\"pl-en\"\u003eask\u003c/span\u003e(), \u003cspan class=\"pl-s1\"\u003emapper\u003c/span\u003e);\n }\n}\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eMonadState\u003c/h3\u003e\u003ca id=\"user-content-monadstate\" class=\"anchor\" aria-label=\"Permalink: MonadState\" href=\"#monadstate\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"public interface MonadState\u0026lt;F, S\u0026gt; extends Monad\u0026lt;F\u0026gt; {\n Kind\u0026lt;F, S\u0026gt; get();\n Kind\u0026lt;F, Unit\u0026gt; set(S state);\n\n default Kind\u0026lt;F, Unit\u0026gt; modify(Operator1\u0026lt;S\u0026gt; mapper) {\n return flatMap(get(), s -\u0026gt; set(mapper.apply(s)));\n }\n\n default \u0026lt;A\u0026gt; Kind\u0026lt;F, A\u0026gt; inspect(Function1\u0026lt;S, A\u0026gt; mapper) {\n return map(get(), mapper);\n }\n\n default \u0026lt;A\u0026gt; Kind\u0026lt;F, A\u0026gt; state(Function1\u0026lt;S, Tuple2\u0026lt;S, A\u0026gt;\u0026gt; mapper) {\n return flatMap(get(), s -\u0026gt; mapper.apply(s).applyTo((s1, a) -\u0026gt; map(set(s1), x -\u0026gt; a)));\n }\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003epublic\u003c/span\u003e \u003cspan class=\"pl-k\"\u003einterface\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eMonadState\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eS\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-k\"\u003eextends\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eMonad\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e\u0026gt; {\n \u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eS\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-en\"\u003eget\u003c/span\u003e();\n \u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eUnit\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-en\"\u003eset\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eS\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003estate\u003c/span\u003e);\n\n \u003cspan class=\"pl-k\"\u003edefault\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eUnit\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-en\"\u003emodify\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eOperator1\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eS\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003emapper\u003c/span\u003e) {\n \u003cspan class=\"pl-k\"\u003ereturn\u003c/span\u003e \u003cspan class=\"pl-en\"\u003eflatMap\u003c/span\u003e(\u003cspan class=\"pl-en\"\u003eget\u003c/span\u003e(), \u003cspan class=\"pl-s1\"\u003es\u003c/span\u003e -\u0026gt; \u003cspan class=\"pl-en\"\u003eset\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003emapper\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eapply\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003es\u003c/span\u003e)));\n }\n\n \u003cspan class=\"pl-k\"\u003edefault\u003c/span\u003e \u0026lt;\u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-en\"\u003einspect\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eFunction1\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eS\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003emapper\u003c/span\u003e) {\n \u003cspan class=\"pl-k\"\u003ereturn\u003c/span\u003e \u003cspan class=\"pl-en\"\u003emap\u003c/span\u003e(\u003cspan class=\"pl-en\"\u003eget\u003c/span\u003e(), \u003cspan class=\"pl-s1\"\u003emapper\u003c/span\u003e);\n }\n\n \u003cspan class=\"pl-k\"\u003edefault\u003c/span\u003e \u0026lt;\u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-en\"\u003estate\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eFunction1\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eS\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eTuple2\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eS\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt;\u0026gt; \u003cspan class=\"pl-s1\"\u003emapper\u003c/span\u003e) {\n \u003cspan class=\"pl-k\"\u003ereturn\u003c/span\u003e \u003cspan class=\"pl-en\"\u003eflatMap\u003c/span\u003e(\u003cspan class=\"pl-en\"\u003eget\u003c/span\u003e(), \u003cspan class=\"pl-s1\"\u003es\u003c/span\u003e -\u0026gt; \u003cspan class=\"pl-s1\"\u003emapper\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eapply\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003es\u003c/span\u003e).\u003cspan class=\"pl-en\"\u003eapplyTo\u003c/span\u003e((\u003cspan class=\"pl-s1\"\u003es1\u003c/span\u003e, \u003cspan class=\"pl-s1\"\u003ea\u003c/span\u003e) -\u0026gt; \u003cspan class=\"pl-en\"\u003emap\u003c/span\u003e(\u003cspan class=\"pl-en\"\u003eset\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003es1\u003c/span\u003e), \u003cspan class=\"pl-s1\"\u003ex\u003c/span\u003e -\u0026gt; \u003cspan class=\"pl-s1\"\u003ea\u003c/span\u003e)));\n }\n}\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eMonadWriter\u003c/h3\u003e\u003ca id=\"user-content-monadwriter\" class=\"anchor\" aria-label=\"Permalink: MonadWriter\" href=\"#monadwriter\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"public interface MonadWriter\u0026lt;F, W\u0026gt; extends Monad\u0026lt;F\u0026gt; {\n\n \u0026lt;A\u0026gt; Kind\u0026lt;F, A\u0026gt; writer(Tuple2\u0026lt;W, A\u0026gt; value);\n \u0026lt;A\u0026gt; Kind\u0026lt;F, Tuple2\u0026lt;W, A\u0026gt;\u0026gt; listen(Kind\u0026lt;F, A\u0026gt; value);\n \u0026lt;A\u0026gt; Kind\u0026lt;F, A\u0026gt; pass(Kind\u0026lt;F, Tuple2\u0026lt;Operator1\u0026lt;W\u0026gt;, A\u0026gt;\u0026gt; value);\n\n default Kind\u0026lt;F, Unit\u0026gt; tell(W writer) {\n return writer(Tuple.of(writer, unit()));\n }\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003epublic\u003c/span\u003e \u003cspan class=\"pl-k\"\u003einterface\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eMonadWriter\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eW\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-k\"\u003eextends\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eMonad\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e\u0026gt; {\n\n \u0026lt;\u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-en\"\u003ewriter\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eTuple2\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eW\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e);\n \u0026lt;\u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eTuple2\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eW\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt;\u0026gt; \u003cspan class=\"pl-en\"\u003elisten\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e);\n \u0026lt;\u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-en\"\u003epass\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eTuple2\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eOperator1\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eW\u003c/span\u003e\u0026gt;, \u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt;\u0026gt; \u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e);\n\n \u003cspan class=\"pl-k\"\u003edefault\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eUnit\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-en\"\u003etell\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eW\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003ewriter\u003c/span\u003e) {\n \u003cspan class=\"pl-k\"\u003ereturn\u003c/span\u003e \u003cspan class=\"pl-en\"\u003ewriter\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eTuple\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eof\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003ewriter\u003c/span\u003e, \u003cspan class=\"pl-en\"\u003eunit\u003c/span\u003e()));\n }\n}\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eComonad\u003c/h3\u003e\u003ca id=\"user-content-comonad\" class=\"anchor\" aria-label=\"Permalink: Comonad\" href=\"#comonad\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"public interface Comonad\u0026lt;F\u0026gt; extends Functor\u0026lt;F\u0026gt; {\n\n \u0026lt;A, B\u0026gt; Kind\u0026lt;F, B\u0026gt; coflatMap(Kind\u0026lt;F, A\u0026gt; value, Function1\u0026lt;Kind\u0026lt;F, A\u0026gt;, B\u0026gt; map);\n\n \u0026lt;A\u0026gt; A extract(Kind\u0026lt;F, A\u0026gt; value);\n\n default \u0026lt;A\u0026gt; Kind\u0026lt;F, Kind\u0026lt;F, A\u0026gt;\u0026gt; coflatten(Kind\u0026lt;F, A\u0026gt; value) {\n return coflatMap(value, identity());\n }\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003epublic\u003c/span\u003e \u003cspan class=\"pl-k\"\u003einterface\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eComonad\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-k\"\u003eextends\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eFunctor\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e\u0026gt; {\n\n \u0026lt;\u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eB\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eB\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-en\"\u003ecoflatMap\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eFunction1\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt;, \u003cspan class=\"pl-smi\"\u003eB\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003emap\u003c/span\u003e);\n\n \u0026lt;\u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e \u003cspan class=\"pl-en\"\u003eextract\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e);\n\n \u003cspan class=\"pl-k\"\u003edefault\u003c/span\u003e \u0026lt;\u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt;\u0026gt; \u003cspan class=\"pl-en\"\u003ecoflatten\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e) {\n \u003cspan class=\"pl-k\"\u003ereturn\u003c/span\u003e \u003cspan class=\"pl-en\"\u003ecoflatMap\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e, \u003cspan class=\"pl-en\"\u003eidentity\u003c/span\u003e());\n }\n}\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eFoldable\u003c/h3\u003e\u003ca id=\"user-content-foldable\" class=\"anchor\" aria-label=\"Permalink: Foldable\" href=\"#foldable\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"public interface Foldable\u0026lt;F\u0026gt; {\n\n \u0026lt;A, B\u0026gt; B foldLeft(Kind\u0026lt;F, A\u0026gt; value, B initial, Function2\u0026lt;B, A, B\u0026gt; mapper);\n\n \u0026lt;A, B\u0026gt; Eval\u0026lt;B\u0026gt; foldRight(Kind\u0026lt;F, A\u0026gt; value, Eval\u0026lt;B\u0026gt; initial, Function2\u0026lt;A, Eval\u0026lt;B\u0026gt;, Eval\u0026lt;B\u0026gt;\u0026gt; mapper);\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003epublic\u003c/span\u003e \u003cspan class=\"pl-k\"\u003einterface\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eFoldable\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e\u0026gt; {\n\n \u0026lt;\u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eB\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-smi\"\u003eB\u003c/span\u003e \u003cspan class=\"pl-en\"\u003efoldLeft\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eB\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003einitial\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eFunction2\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eB\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eB\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003emapper\u003c/span\u003e);\n\n \u0026lt;\u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eB\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-smi\"\u003eEval\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eB\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-en\"\u003efoldRight\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eEval\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eB\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003einitial\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eFunction2\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eEval\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eB\u003c/span\u003e\u0026gt;, \u003cspan class=\"pl-smi\"\u003eEval\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eB\u003c/span\u003e\u0026gt;\u0026gt; \u003cspan class=\"pl-s1\"\u003emapper\u003c/span\u003e);\n}\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eTraverse\u003c/h3\u003e\u003ca id=\"user-content-traverse\" class=\"anchor\" aria-label=\"Permalink: Traverse\" href=\"#traverse\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"public interface Traverse\u0026lt;F\u0026gt; extends Functor\u0026lt;F\u0026gt;, Foldable\u0026lt;F\u0026gt; {\n\n \u0026lt;G, T, R\u0026gt; Kind\u0026lt;G, Kind\u0026lt;F, R\u0026gt;\u0026gt; traverse(Applicative\u0026lt;G\u0026gt; applicative, Kind\u0026lt;F, T\u0026gt; value,\n Function1\u0026lt;T, ? extends Kind\u0026lt;G, R\u0026gt;\u0026gt; mapper);\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003epublic\u003c/span\u003e \u003cspan class=\"pl-k\"\u003einterface\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eTraverse\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-k\"\u003eextends\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eFunctor\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e\u0026gt;, \u003cspan class=\"pl-smi\"\u003eFoldable\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e\u0026gt; {\n\n \u0026lt;\u003cspan class=\"pl-smi\"\u003eG\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eT\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eR\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eG\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eR\u003c/span\u003e\u0026gt;\u0026gt; \u003cspan class=\"pl-en\"\u003etraverse\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eApplicative\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eG\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003eapplicative\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eT\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e,\n \u003cspan class=\"pl-smi\"\u003eFunction1\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eT\u003c/span\u003e, ? \u003cspan class=\"pl-k\"\u003eextends\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eG\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eR\u003c/span\u003e\u0026gt;\u0026gt; \u003cspan class=\"pl-s1\"\u003emapper\u003c/span\u003e);\n}\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eSemigroupal\u003c/h3\u003e\u003ca id=\"user-content-semigroupal\" class=\"anchor\" aria-label=\"Permalink: Semigroupal\" href=\"#semigroupal\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"public interface Semigroupal\u0026lt;F\u0026gt; {\n\n \u0026lt;A, B\u0026gt; Kind\u0026lt;F, Tuple2\u0026lt;A, B\u0026gt;\u0026gt; product(Kind\u0026lt;F, A\u0026gt; fa, Kind\u0026lt;F, B\u0026gt; fb);\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003epublic\u003c/span\u003e \u003cspan class=\"pl-k\"\u003einterface\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eSemigroupal\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e\u0026gt; {\n\n \u0026lt;\u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eB\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eTuple2\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eB\u003c/span\u003e\u0026gt;\u0026gt; \u003cspan class=\"pl-en\"\u003eproduct\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003efa\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eB\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003efb\u003c/span\u003e);\n}\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eDefer\u003c/h3\u003e\u003ca id=\"user-content-defer\" class=\"anchor\" aria-label=\"Permalink: Defer\" href=\"#defer\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"public interface Defer\u0026lt;F\u0026gt; {\n\n \u0026lt;A\u0026gt; Kind\u0026lt;F, A\u0026gt; defer(Producer\u0026lt;Kind\u0026lt;F, A\u0026gt;\u0026gt; defer);\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003epublic\u003c/span\u003e \u003cspan class=\"pl-k\"\u003einterface\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eDefer\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e\u0026gt; {\n\n \u0026lt;\u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-en\"\u003edefer\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eProducer\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt;\u0026gt; \u003cspan class=\"pl-s1\"\u003edefer\u003c/span\u003e);\n}\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eBracket\u003c/h3\u003e\u003ca id=\"user-content-bracket\" class=\"anchor\" aria-label=\"Permalink: Bracket\" href=\"#bracket\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"public interface Bracket\u0026lt;F, E\u0026gt; extends MonadError\u0026lt;F, E\u0026gt; {\n\n \u0026lt;A, B\u0026gt; Kind\u0026lt;F, B\u0026gt; bracket(Kind\u0026lt;F, A\u0026gt; acquire, Function1\u0026lt;A, ? extends Kind\u0026lt;F, B\u0026gt;\u0026gt; use, Consumer1\u0026lt;A\u0026gt; release);\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003epublic\u003c/span\u003e \u003cspan class=\"pl-k\"\u003einterface\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eBracket\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eE\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-k\"\u003eextends\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eMonadError\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eE\u003c/span\u003e\u0026gt; {\n\n \u0026lt;\u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eB\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eB\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-en\"\u003ebracket\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003eacquire\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eFunction1\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e, ? \u003cspan class=\"pl-k\"\u003eextends\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eB\u003c/span\u003e\u0026gt;\u0026gt; \u003cspan class=\"pl-s1\"\u003euse\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eConsumer1\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003erelease\u003c/span\u003e);\n}\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eMonadDefer\u003c/h3\u003e\u003ca id=\"user-content-monaddefer\" class=\"anchor\" aria-label=\"Permalink: MonadDefer\" href=\"#monaddefer\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"public interface MonadDefer\u0026lt;F\u0026gt; extends MonadThrow\u0026lt;F\u0026gt;, Bracket\u0026lt;F, Throwable\u0026gt;, Defer\u0026lt;F\u0026gt;, Timer\u0026lt;F\u0026gt; {\n\n default \u0026lt;A\u0026gt; Kind\u0026lt;F, A\u0026gt; later(Producer\u0026lt;A\u0026gt; later) {\n return defer(() -\u0026gt; Try.of(later::get).fold(this::raiseError, this::pure));\n }\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003epublic\u003c/span\u003e \u003cspan class=\"pl-k\"\u003einterface\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eMonadDefer\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-k\"\u003eextends\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eMonadThrow\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e\u0026gt;, \u003cspan class=\"pl-smi\"\u003eBracket\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eThrowable\u003c/span\u003e\u0026gt;, \u003cspan class=\"pl-smi\"\u003eDefer\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e\u0026gt;, \u003cspan class=\"pl-smi\"\u003eTimer\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e\u0026gt; {\n\n \u003cspan class=\"pl-k\"\u003edefault\u003c/span\u003e \u0026lt;\u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-en\"\u003elater\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eProducer\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003elater\u003c/span\u003e) {\n \u003cspan class=\"pl-k\"\u003ereturn\u003c/span\u003e \u003cspan class=\"pl-en\"\u003edefer\u003c/span\u003e(() -\u0026gt; \u003cspan class=\"pl-smi\"\u003eTry\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eof\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003elater\u003c/span\u003e::\u003cspan class=\"pl-s1\"\u003eget\u003c/span\u003e).\u003cspan class=\"pl-en\"\u003efold\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003ethis\u003c/span\u003e::\u003cspan class=\"pl-s1\"\u003eraiseError\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003ethis\u003c/span\u003e::\u003cspan class=\"pl-s1\"\u003epure\u003c/span\u003e));\n }\n}\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eAsync\u003c/h3\u003e\u003ca id=\"user-content-async\" class=\"anchor\" aria-label=\"Permalink: Async\" href=\"#async\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"public interface Async\u0026lt;F\u0026gt; extends MonadDefer\u0026lt;F\u0026gt; {\n \n \u0026lt;A\u0026gt; Kind\u0026lt;F, A\u0026gt; async(Consumer1\u0026lt;Consumer1\u0026lt;Try\u0026lt;A\u0026gt;\u0026gt;\u0026gt; consumer);\n\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003epublic\u003c/span\u003e \u003cspan class=\"pl-k\"\u003einterface\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eAsync\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-k\"\u003eextends\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eMonadDefer\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e\u0026gt; {\n \n \u0026lt;\u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-en\"\u003easync\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eConsumer1\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eConsumer1\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eTry\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eA\u003c/span\u003e\u0026gt;\u0026gt;\u0026gt; \u003cspan class=\"pl-s1\"\u003econsumer\u003c/span\u003e);\n\n}\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eTimer\u003c/h3\u003e\u003ca id=\"user-content-timer\" class=\"anchor\" aria-label=\"Permalink: Timer\" href=\"#timer\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"public interface Timer\u0026lt;F\u0026gt; {\n\n Kind\u0026lt;F, Unit\u0026gt; sleep(Duration duration);\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003epublic\u003c/span\u003e \u003cspan class=\"pl-k\"\u003einterface\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eTimer\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e\u0026gt; {\n\n \u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eUnit\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-en\"\u003esleep\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eDuration\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eduration\u003c/span\u003e);\n}\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eFunctionK\u003c/h3\u003e\u003ca id=\"user-content-functionk\" class=\"anchor\" aria-label=\"Permalink: FunctionK\" href=\"#functionk\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIt represents a natural transformation between two different kinds.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"public interface FunctionK\u0026lt;F, G\u0026gt; {\n \u0026lt;T\u0026gt; Kind\u0026lt;G, T\u0026gt; apply(Kind\u0026lt;F, T\u0026gt; from);\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003epublic\u003c/span\u003e \u003cspan class=\"pl-k\"\u003einterface\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eFunctionK\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eG\u003c/span\u003e\u0026gt; {\n \u0026lt;\u003cspan class=\"pl-smi\"\u003eT\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eG\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eT\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-en\"\u003eapply\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eKind\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eF\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eT\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003efrom\u003c/span\u003e);\n}\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eOptics\u003c/h2\u003e\u003ca id=\"user-content-optics\" class=\"anchor\" aria-label=\"Permalink: Optics\" href=\"#optics\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\" __Iso__\n / \\\n Lens Prism\n \\ /\n Optional\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003e __Iso__\n / \\\n Lens Prism\n \\ /\n Optional\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eIso\u003c/h3\u003e\u003ca id=\"user-content-iso\" class=\"anchor\" aria-label=\"Permalink: Iso\" href=\"#iso\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eAn \u003ccode\u003eIso\u003c/code\u003e is an optic which converts elements of some type into elements of other type without loss.\nIn other words, it's \u003cstrong\u003eisomorphic\u003c/strong\u003e.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"Point point = new Point(1, 2);\n\nIso\u0026lt;Point, Tuple2\u0026lt;Integer, Integer\u0026gt;\u0026gt; pointToTuple = \n Iso.of(p -\u0026gt; Tuple.of(p.x, p.y), \n t -\u0026gt; new Point(t.get1(), t.get2()));\n\nassertEquals(point, pointToTuple.set(pointToTuple.get(point)));\"\u003e\u003cpre\u003e\u003cspan class=\"pl-smi\"\u003ePoint\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003epoint\u003c/span\u003e = \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003ePoint\u003c/span\u003e(\u003cspan class=\"pl-c1\"\u003e1\u003c/span\u003e, \u003cspan class=\"pl-c1\"\u003e2\u003c/span\u003e);\n\n\u003cspan class=\"pl-smi\"\u003eIso\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003ePoint\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eTuple2\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eInteger\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eInteger\u003c/span\u003e\u0026gt;\u0026gt; \u003cspan class=\"pl-s1\"\u003epointToTuple\u003c/span\u003e = \n \u003cspan class=\"pl-smi\"\u003eIso\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eof\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003ep\u003c/span\u003e -\u0026gt; \u003cspan class=\"pl-smi\"\u003eTuple\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eof\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003ep\u003c/span\u003e.\u003cspan class=\"pl-s1\"\u003ex\u003c/span\u003e, \u003cspan class=\"pl-s1\"\u003ep\u003c/span\u003e.\u003cspan class=\"pl-s1\"\u003ey\u003c/span\u003e), \n \u003cspan class=\"pl-s1\"\u003et\u003c/span\u003e -\u0026gt; \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003ePoint\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003et\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eget1\u003c/span\u003e(), \u003cspan class=\"pl-s1\"\u003et\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eget2\u003c/span\u003e()));\n\n\u003cspan class=\"pl-en\"\u003eassertEquals\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003epoint\u003c/span\u003e, \u003cspan class=\"pl-s1\"\u003epointToTuple\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eset\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003epointToTuple\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eget\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003epoint\u003c/span\u003e)));\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eLens\u003c/h3\u003e\u003ca id=\"user-content-lens\" class=\"anchor\" aria-label=\"Permalink: Lens\" href=\"#lens\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eA \u003ccode\u003eLens\u003c/code\u003e is an optic used to zoom inside a structure. In other words, it's an abstraction of a setter and a getter\nbut with immutable objects.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"Lens\u0026lt;Employee, String\u0026gt; nameLens = Lens.of(Employee::getName, Employee::withName);\n\nEmployee pepe = new Employee(\u0026quot;pepe\u0026quot;);\n\nassertEquals(\u0026quot;pepe\u0026quot;, nameLens.get(pepe));\nassertEquals(\u0026quot;paco\u0026quot;, nameLens.get(nameLens.set(pepe, \u0026quot;paco\u0026quot;)));\"\u003e\u003cpre\u003e\u003cspan class=\"pl-smi\"\u003eLens\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eEmployee\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003enameLens\u003c/span\u003e = \u003cspan class=\"pl-smi\"\u003eLens\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eof\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eEmployee\u003c/span\u003e::\u003cspan class=\"pl-s1\"\u003egetName\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eEmployee\u003c/span\u003e::\u003cspan class=\"pl-s1\"\u003ewithName\u003c/span\u003e);\n\n\u003cspan class=\"pl-smi\"\u003eEmployee\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003epepe\u003c/span\u003e = \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eEmployee\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"pepe\"\u003c/span\u003e);\n\n\u003cspan class=\"pl-en\"\u003eassertEquals\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"pepe\"\u003c/span\u003e, \u003cspan class=\"pl-s1\"\u003enameLens\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eget\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003epepe\u003c/span\u003e));\n\u003cspan class=\"pl-en\"\u003eassertEquals\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"paco\"\u003c/span\u003e, \u003cspan class=\"pl-s1\"\u003enameLens\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eget\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003enameLens\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eset\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003epepe\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e\"paco\"\u003c/span\u003e)));\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eWe can compose Lenses to get deeper inside. For example, if we add an attribute of type \u003ccode\u003eAddress\u003c/code\u003e into \u003ccode\u003eEmployee\u003c/code\u003e.\nWe can create a lens to access the city name of the address of the employee.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"Lens\u0026lt;Employee, Address\u0026gt; addressLens = Lens.of(Employee::getAddress, Employee::withAddress);\nLens\u0026lt;Address, String\u0026gt; cityLens = Lens.of(Address::getCity, Address::withCity);\nLens\u0026lt;Employee, String\u0026gt; cityAddressLens = addressLens.compose(cityLens);\n\nEmployee pepe = new Employee(\u0026quot;pepe\u0026quot;, new Address(\u0026quot;Madrid\u0026quot;));\n\nassertEquals(\u0026quot;Madrid\u0026quot;, cityAddressLens.get(pepe));\"\u003e\u003cpre\u003e\u003cspan class=\"pl-smi\"\u003eLens\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eEmployee\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eAddress\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003eaddressLens\u003c/span\u003e = \u003cspan class=\"pl-smi\"\u003eLens\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eof\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eEmployee\u003c/span\u003e::\u003cspan class=\"pl-s1\"\u003egetAddress\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eEmployee\u003c/span\u003e::\u003cspan class=\"pl-s1\"\u003ewithAddress\u003c/span\u003e);\n\u003cspan class=\"pl-smi\"\u003eLens\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eAddress\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003ecityLens\u003c/span\u003e = \u003cspan class=\"pl-smi\"\u003eLens\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eof\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eAddress\u003c/span\u003e::\u003cspan class=\"pl-s1\"\u003egetCity\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eAddress\u003c/span\u003e::\u003cspan class=\"pl-s1\"\u003ewithCity\u003c/span\u003e);\n\u003cspan class=\"pl-smi\"\u003eLens\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eEmployee\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003ecityAddressLens\u003c/span\u003e = \u003cspan class=\"pl-s1\"\u003eaddressLens\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003ecompose\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003ecityLens\u003c/span\u003e);\n\n\u003cspan class=\"pl-smi\"\u003eEmployee\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003epepe\u003c/span\u003e = \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eEmployee\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"pepe\"\u003c/span\u003e, \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eAddress\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"Madrid\"\u003c/span\u003e));\n\n\u003cspan class=\"pl-en\"\u003eassertEquals\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"Madrid\"\u003c/span\u003e, \u003cspan class=\"pl-s1\"\u003ecityAddressLens\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eget\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003epepe\u003c/span\u003e));\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003ePrism\u003c/h3\u003e\u003ca id=\"user-content-prism\" class=\"anchor\" aria-label=\"Permalink: Prism\" href=\"#prism\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eA \u003ccode\u003ePrism\u003c/code\u003e is a lossless invertible optic that can see into a structure and optionally find a value.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"Function1\u0026lt;String, Option\u0026lt;Integer\u0026gt;\u0026gt; parseInt = ...; // is a method that only returns a value when the string can be parsed\n\nPrism\u0026lt;String, Integer\u0026gt; stringToInteger = Prism.of(parseInt, String::valueOf);\n\nassertEquals(Option.some(5), stringToInteger.getOption(\u0026quot;5\u0026quot;));\nassertEquals(Option.none(), stringToInteger.getOption(\u0026quot;a\u0026quot;));\nassertEquals(\u0026quot;5\u0026quot;, stringToInteger.reverseGet(5));\"\u003e\u003cpre\u003e\u003cspan class=\"pl-smi\"\u003eFunction1\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eOption\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eInteger\u003c/span\u003e\u0026gt;\u0026gt; \u003cspan class=\"pl-s1\"\u003eparseInt\u003c/span\u003e = ...; \u003cspan class=\"pl-c\"\u003e// is a method that only returns a value when the string can be parsed\u003c/span\u003e\n\n\u003cspan class=\"pl-smi\"\u003ePrism\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eInteger\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003estringToInteger\u003c/span\u003e = \u003cspan class=\"pl-smi\"\u003ePrism\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eof\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003eparseInt\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e::\u003cspan class=\"pl-s1\"\u003evalueOf\u003c/span\u003e);\n\n\u003cspan class=\"pl-en\"\u003eassertEquals\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eOption\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003esome\u003c/span\u003e(\u003cspan class=\"pl-c1\"\u003e5\u003c/span\u003e), \u003cspan class=\"pl-s1\"\u003estringToInteger\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003egetOption\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"5\"\u003c/span\u003e));\n\u003cspan class=\"pl-en\"\u003eassertEquals\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eOption\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003enone\u003c/span\u003e(), \u003cspan class=\"pl-s1\"\u003estringToInteger\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003egetOption\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"a\"\u003c/span\u003e));\n\u003cspan class=\"pl-en\"\u003eassertEquals\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"5\"\u003c/span\u003e, \u003cspan class=\"pl-s1\"\u003estringToInteger\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003ereverseGet\u003c/span\u003e(\u003cspan class=\"pl-c1\"\u003e5\u003c/span\u003e));\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eOptional\u003c/h3\u003e\u003ca id=\"user-content-optional\" class=\"anchor\" aria-label=\"Permalink: Optional\" href=\"#optional\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eAn \u003ccode\u003eOptional\u003c/code\u003e is an optic that allows to see into a structure and getting, setting like a \u003ccode\u003eLens\u003c/code\u003e an optional find a value like a \u003ccode\u003ePrism\u003c/code\u003e.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"Optional\u0026lt;Employee, Address\u0026gt; addressOptional = Optional.of(\n Employee::withAddress, employee -\u0026gt; Option.of(employee::getAddress)\n);\n\nAddress madrid = new Address(\u0026quot;Madrid\u0026quot;);\nEmployee pepe = new Employee(\u0026quot;pepe\u0026quot;, null);\n\nassertEquals(Option.none(), addressOptional.getOption(pepe));\nassertEquals(Option.some(madrid), addressOptional.getOption(addressOptional.set(pepe, madrid)));\"\u003e\u003cpre\u003e\u003cspan class=\"pl-smi\"\u003eOptional\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-smi\"\u003eEmployee\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003eAddress\u003c/span\u003e\u0026gt; \u003cspan class=\"pl-s1\"\u003eaddressOptional\u003c/span\u003e = \u003cspan class=\"pl-smi\"\u003eOptional\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eof\u003c/span\u003e(\n \u003cspan class=\"pl-smi\"\u003eEmployee\u003c/span\u003e::\u003cspan class=\"pl-s1\"\u003ewithAddress\u003c/span\u003e, \u003cspan class=\"pl-s1\"\u003eemployee\u003c/span\u003e -\u0026gt; \u003cspan class=\"pl-smi\"\u003eOption\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eof\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003eemployee\u003c/span\u003e::\u003cspan class=\"pl-s1\"\u003egetAddress\u003c/span\u003e)\n);\n\n\u003cspan class=\"pl-smi\"\u003eAddress\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003emadrid\u003c/span\u003e = \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eAddress\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"Madrid\"\u003c/span\u003e);\n\u003cspan class=\"pl-smi\"\u003eEmployee\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003epepe\u003c/span\u003e = \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eEmployee\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"pepe\"\u003c/span\u003e, \u003cspan class=\"pl-c1\"\u003enull\u003c/span\u003e);\n\n\u003cspan class=\"pl-en\"\u003eassertEquals\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eOption\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003enone\u003c/span\u003e(), \u003cspan class=\"pl-s1\"\u003eaddressOptional\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003egetOption\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003epepe\u003c/span\u003e));\n\u003cspan class=\"pl-en\"\u003eassertEquals\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eOption\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003esome\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003emadrid\u003c/span\u003e), \u003cspan class=\"pl-s1\"\u003eaddressOptional\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003egetOption\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003eaddressOptional\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003eset\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003epepe\u003c/span\u003e, \u003cspan class=\"pl-s1\"\u003emadrid\u003c/span\u003e)));\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eComposition\u003c/h3\u003e\u003ca id=\"user-content-composition\" class=\"anchor\" aria-label=\"Permalink: Composition\" href=\"#composition\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cmarkdown-accessiblity-table\u003e\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003c/th\u003e\n\u003cth\u003eOptional\u003c/th\u003e\n\u003cth\u003ePrism\u003c/th\u003e\n\u003cth\u003eLens\u003c/th\u003e\n\u003cth\u003eIso\u003c/th\u003e\n\u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptional\u003c/td\u003e\n\u003ctd\u003eOptional\u003c/td\u003e\n\u003ctd\u003eOptional\u003c/td\u003e\n\u003ctd\u003eOptional\u003c/td\u003e\n\u003ctd\u003eOptional\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrism\u003c/td\u003e\n\u003ctd\u003eOptional\u003c/td\u003e\n\u003ctd\u003ePrism\u003c/td\u003e\n\u003ctd\u003eOptional\u003c/td\u003e\n\u003ctd\u003ePrism\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens\u003c/td\u003e\n\u003ctd\u003eOptional\u003c/td\u003e\n\u003ctd\u003eOptional\u003c/td\u003e\n\u003ctd\u003eLens\u003c/td\u003e\n\u003ctd\u003eLens\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIso\u003c/td\u003e\n\u003ctd\u003eOptional\u003c/td\u003e\n\u003ctd\u003ePrism\u003c/td\u003e\n\u003ctd\u003eLens\u003c/td\u003e\n\u003ctd\u003eIso\u003c/td\u003e\n\u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\u003c/markdown-accessiblity-table\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eEqual\u003c/h2\u003e\u003ca id=\"user-content-equal\" class=\"anchor\" aria-label=\"Permalink: Equal\" href=\"#equal\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis class helps to create readable \u003ccode\u003eequals\u003c/code\u003e methods. An example:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-java notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"@Override\npublic boolean equals(Object obj) {\n return Equal.\u0026lt;Data\u0026gt;of()\n .comparing(Data::getId)\n .comparing(Data::getValue)\n .applyTo(this, obj);\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-c1\"\u003e@\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003eOverride\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003epublic\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eboolean\u003c/span\u003e \u003cspan class=\"pl-en\"\u003eequals\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eObject\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eobj\u003c/span\u003e) {\n \u003cspan class=\"pl-k\"\u003ereturn\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eEqual\u003c/span\u003e.\u0026lt;\u003cspan class=\"pl-smi\"\u003eData\u003c/span\u003e\u0026gt;\u003cspan class=\"pl-en\"\u003eof\u003c/span\u003e()\n .\u003cspan class=\"pl-en\"\u003ecomparing\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eData\u003c/span\u003e::\u003cspan class=\"pl-s1\"\u003egetId\u003c/span\u003e)\n .\u003cspan class=\"pl-en\"\u003ecomparing\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eData\u003c/span\u003e::\u003cspan class=\"pl-s1\"\u003egetValue\u003c/span\u003e)\n .\u003cspan class=\"pl-en\"\u003eapplyTo\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003ethis\u003c/span\u003e, \u003cspan class=\"pl-s1\"\u003eobj\u003c/span\u003e);\n}\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eStargazers over time\u003c/h2\u003e\u003ca id=\"user-content-stargazers-over-time\" class=\"anchor\" aria-label=\"Permalink: Stargazers over time\" href=\"#stargazers-over-time\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003ca href=\"https://starchart.cc/tonivade/purefun\" rel=\"nofollow\"\u003e\u003cimg src=\"https://camo.githubusercontent.com/1bc53b2190634636a678bcca9a87ffd840135f393f49c749a3842879da7d2aa0/68747470733a2f2f7374617263686172742e63632f746f6e69766164652f7075726566756e2e737667\" alt=\"Stargazers over time\" data-canonical-src=\"https://starchart.cc/tonivade/purefun.svg\" style=\"max-width: 100%;\"\u003e\u003c/a\u003e\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eLicense\u003c/h2\u003e\u003ca id=\"user-content-license\" class=\"anchor\" aria-label=\"Permalink: License\" href=\"#license\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003epurefun is released under MIT license\u003c/p\u003e\n\u003c/article\u003e","loaded":true,"timedOut":false,"errorMessage":null,"headerInfo":{"toc":[{"level":1,"text":"Purefun","anchor":"purefun","htmlText":"Purefun"},{"level":2,"text":"Disclaimer","anchor":"disclaimer","htmlText":"Disclaimer"},{"level":2,"text":"Higher Kinded Types","anchor":"higher-kinded-types","htmlText":"Higher Kinded Types"},{"level":2,"text":"Annotation Processor","anchor":"annotation-processor","htmlText":"Annotation Processor"},{"level":2,"text":"Data types","anchor":"data-types","htmlText":"Data types"},{"level":3,"text":"Option","anchor":"option","htmlText":"Option"},{"level":3,"text":"Try","anchor":"try","htmlText":"Try"},{"level":3,"text":"Either","anchor":"either","htmlText":"Either"},{"level":3,"text":"Validation","anchor":"validation","htmlText":"Validation"},{"level":3,"text":"Const","anchor":"const","htmlText":"Const"},{"level":3,"text":"Future","anchor":"future","htmlText":"Future"},{"level":3,"text":"Trampoline","anchor":"trampoline","htmlText":"Trampoline"},{"level":3,"text":"Tuples","anchor":"tuples","htmlText":"Tuples"},{"level":2,"text":"Data structures","anchor":"data-structures","htmlText":"Data structures"},{"level":3,"text":"Sequence","anchor":"sequence","htmlText":"Sequence"},{"level":3,"text":"ImmutableList","anchor":"immutablelist","htmlText":"ImmutableList"},{"level":3,"text":"ImmutableSet","anchor":"immutableset","htmlText":"ImmutableSet"},{"level":3,"text":"ImmutableArray","anchor":"immutablearray","htmlText":"ImmutableArray"},{"level":3,"text":"ImmutableMap","anchor":"immutablemap","htmlText":"ImmutableMap"},{"level":3,"text":"ImmutableTree","anchor":"immutabletree","htmlText":"ImmutableTree"},{"level":3,"text":"ImmutableTreeMap","anchor":"immutabletreemap","htmlText":"ImmutableTreeMap"},{"level":2,"text":"Monads","anchor":"monads","htmlText":"Monads"},{"level":3,"text":"State Monad","anchor":"state-monad","htmlText":"State Monad"},{"level":3,"text":"Reader Monad","anchor":"reader-monad","htmlText":"Reader Monad"},{"level":3,"text":"Writer Monad","anchor":"writer-monad","htmlText":"Writer Monad"},{"level":3,"text":"IO Monad","anchor":"io-monad","htmlText":"IO Monad"},{"level":2,"text":"Free","anchor":"free","htmlText":"Free"},{"level":3,"text":"Free Monad","anchor":"free-monad","htmlText":"Free Monad"},{"level":3,"text":"Free Applicative","anchor":"free-applicative","htmlText":"Free Applicative"},{"level":2,"text":"Monad Transformers","anchor":"monad-transformers","htmlText":"Monad Transformers"},{"level":3,"text":"OptionT","anchor":"optiont","htmlText":"OptionT"},{"level":3,"text":"EitherT","anchor":"eithert","htmlText":"EitherT"},{"level":3,"text":"StateT","anchor":"statet","htmlText":"StateT"},{"level":3,"text":"WriterT","anchor":"writert","htmlText":"WriterT"},{"level":3,"text":"Kleisli","anchor":"kleisli","htmlText":"Kleisli"},{"level":2,"text":"Stream","anchor":"stream","htmlText":"Stream"},{"level":2,"text":"Effects","anchor":"effects","htmlText":"Effects"},{"level":2,"text":"Type Classes","anchor":"type-classes","htmlText":"Type Classes"},{"level":3,"text":"Functor","anchor":"functor","htmlText":"Functor"},{"level":3,"text":"Applicative","anchor":"applicative","htmlText":"Applicative"},{"level":3,"text":"Selective","anchor":"selective","htmlText":"Selective"},{"level":3,"text":"Monad","anchor":"monad","htmlText":"Monad"},{"level":3,"text":"Semigroup","anchor":"semigroup","htmlText":"Semigroup"},{"level":3,"text":"Monoid","anchor":"monoid","htmlText":"Monoid"},{"level":3,"text":"SemigroupK","anchor":"semigroupk","htmlText":"SemigroupK"},{"level":3,"text":"MonoidK","anchor":"monoidk","htmlText":"MonoidK"},{"level":3,"text":"Invariant","anchor":"invariant","htmlText":"Invariant"},{"level":3,"text":"Contravariant","anchor":"contravariant","htmlText":"Contravariant"},{"level":3,"text":"Applicative Error","anchor":"applicative-error","htmlText":"Applicative Error"},{"level":3,"text":"Monad Error","anchor":"monad-error","htmlText":"Monad Error"},{"level":3,"text":"Monad Throw","anchor":"monad-throw","htmlText":"Monad 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js-snippet-clipboard-copy-unpositioned undefined" data-hpc="true"><article class="markdown-body entry-content container-lg" itemprop="text"><div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">Purefun</h1><a id="user-content-purefun" class="anchor" aria-label="Permalink: Purefun" href="#purefun"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content=" ____ __ | _ \ _ _ _ __ ___ / _|_ _ _ __ | |_) | | | | '__/ _ \ |_| | | | '_ \ | __/| |_| | | | __/ _| |_| | | | | |_| \__,_|_| \___|_| \__,_|_| |_|"><pre class="notranslate"><code> ____ __ | _ \ _ _ _ __ ___ / _|_ _ _ __ | |_) | | | | '__/ _ \ |_| | | | '_ \ | __/| |_| | | | __/ _| |_| | | | | |_| \__,_|_| \___|_| \__,_|_| |_| </code></pre></div> <p dir="auto"><a target="_blank" rel="noopener noreferrer" href="https://github.com/tonivade/purefun/workflows/Java%20CI%20with%20Gradle/badge.svg"><img src="https://github.com/tonivade/purefun/workflows/Java%20CI%20with%20Gradle/badge.svg" alt="Build Status" style="max-width: 100%;"></a> <a href="https://www.codacy.com/app/zeromock/purefun?utm_source=github.com&utm_medium=referral&utm_content=tonivade/purefun&utm_campaign=Badge_Coverage" rel="nofollow"><img src="https://camo.githubusercontent.com/997f127f161e2271dab05170420f449c93747439bd7cde7b8a38d29514002415/68747470733a2f2f6170692e636f646163792e636f6d2f70726f6a6563742f62616467652f436f7665726167652f3338343232646231363164613438663039636431393263376537636161376464" alt="Codacy Badge" data-canonical-src="https://api.codacy.com/project/badge/Coverage/38422db161da48f09cd192c7e7caa7dd" style="max-width: 100%;"></a> <a href="https://gitter.im/tonivade/purefun?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge" rel="nofollow"><img src="https://camo.githubusercontent.com/d9856b21439449403f252aef1cd3ab62f97725f0ace6f6111eee8868de2ce93f/68747470733a2f2f6261646765732e6769747465722e696d2f746f6e69766164652f7075726566756e2e737667" alt="Join the chat at https://gitter.im/tonivade/purefun" data-canonical-src="https://badges.gitter.im/tonivade/purefun.svg" style="max-width: 100%;"></a></p> <p dir="auto">This module was developed as the core of the zeromock project. It defines all the basic classes and interfaces used in the rest of the project.</p> <p dir="auto">Initially the module only held a few basic interfaces and it has grown to become an entire functional programming library (well, a humble one), and now is an independent library.</p> <p dir="auto">Working in this library helped me to learn and understand some important concepts of functional programming, and over time I implemented higher kinded types and type classes in Java. I don't know if this will be helpful for somebody, but the work is here to everyone want to use it.</p> <p dir="auto">Finally, I have to say thanks to <a href="https://www.vavr.io/" rel="nofollow">vavr</a> library author, this library is largely inspired in his work, and also to <a href="https://www.scala-lang.org/" rel="nofollow">Scala</a> standard library authors. I don't want to forget some of the projects I've used as reference: <a href="https://arrow-kt.io/" rel="nofollow">Arrow</a> and <a href="https://typelevel.org/cats/" rel="nofollow">cats</a> for type classes implementation, <a href="https://fs2.io/" rel="nofollow">fs2</a> for stream processing, and <a href="https://zio.dev/" rel="nofollow">ZIO</a> to implement my own version in Java. Their awesome work help me a lot.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Disclaimer</h2><a id="user-content-disclaimer" class="anchor" aria-label="Permalink: Disclaimer" href="#disclaimer"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto"><strong>This project is not ready to be used in production</strong>, I use it to learn functional programming concepts by my self, but, if you want to use it, <strong>use it at your own risk</strong>. Anyway if you think is useful for you, go ahead, also any feedback and PR are very welcome.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Higher Kinded Types</h2><a id="user-content-higher-kinded-types" class="anchor" aria-label="Permalink: Higher Kinded Types" href="#higher-kinded-types"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">In this project I have implemented some patterns of functional programming that need Higher Kinded Types. In Java there are not such thing, but it can be simulated using a especial codification of types.</p> <p dir="auto">In Scala we can define a higher kinded typed just like this <code>Monad[F[_]]</code> but in Java it can be codified like this <code>Monad<F></code>. Then we can define a type using a special codification like this:</p> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="interface SomeType<T> extends SomeTypeOf<T> { } // Boilerplate interface SomeTypeOf<T> implements Kind<SomeType<?>, T> { // this is a safe cast static SomeType<T> toSomeType(Kind<SomeType<?>, ? extends T> hkt) { return (SomeType<T>) hkt; } }"><pre><span class="pl-k">interface</span> <span class="pl-smi">SomeType</span><<span class="pl-smi">T</span>> <span class="pl-k">extends</span> <span class="pl-smi">SomeTypeOf</span><<span class="pl-smi">T</span>> { } <span class="pl-c">// Boilerplate</span> <span class="pl-k">interface</span> <span class="pl-smi">SomeTypeOf</span><<span class="pl-smi">T</span>> <span class="pl-k">implements</span> <span class="pl-s1">Kind</span><<span class="pl-smi">SomeType</span><?>, <span class="pl-s1">T</span>> { <span class="pl-c">// this is a safe cast</span> <span class="pl-k">static</span> <span class="pl-smi">SomeType</span><<span class="pl-smi">T</span>> <span class="pl-en">toSomeType</span>(<span class="pl-smi">Kind</span><<span class="pl-smi">SomeType</span><?>, ? <span class="pl-k">extends</span> <span class="pl-smi">T</span>> <span class="pl-s1">hkt</span>) { <span class="pl-k">return</span> (<span class="pl-smi">SomeType</span><<span class="pl-smi">T</span>>) <span class="pl-s1">hkt</span>; } }</pre></div> <p dir="auto">It can be triky but, in the end is easy to work with. By the way, I tried to hide this details to the user of the library. Except with type classes because is the only way to implement them correctly.</p> <p dir="auto">So, there are interfaces to encode kinds of 1, 2 and 3 types. It can be defined types for 4, 5 or more types, but it wasn't necessary to implement the library.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Annotation Processor</h2><a id="user-content-annotation-processor" class="anchor" aria-label="Permalink: Annotation Processor" href="#annotation-processor"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">In order to simplify working with higher kinded types, in the last version I've included an annotation processor to generate all this boilerplate code:</p> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="@HigherKind interface SomeType<T> extends SomeTypeOf<T> { }"><pre><span class="pl-c1">@</span><span class="pl-c1">HigherKind</span> <span class="pl-k">interface</span> <span class="pl-smi">SomeType</span><<span class="pl-smi">T</span>> <span class="pl-k">extends</span> <span class="pl-smi">SomeTypeOf</span><<span class="pl-smi">T</span>> { }</pre></div> <p dir="auto">With this annotation, all the above code, is generated automatically.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Data types</h2><a id="user-content-data-types" class="anchor" aria-label="Permalink: Data types" href="#data-types"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Option</h3><a id="user-content-option" class="anchor" aria-label="Permalink: Option" href="#option"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Is an alternative to <code>Optional</code> of Java standard library. It can contains two values, a <code>some</code> or a <code>none</code></p> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="Option<String> some = Option.some("Hello world"); Option<String> none = Option.none();"><pre><span class="pl-smi">Option</span><<span class="pl-smi">String</span>> <span class="pl-s1">some</span> = <span class="pl-smi">Option</span>.<span class="pl-en">some</span>(<span class="pl-s">"Hello world"</span>); <span class="pl-smi">Option</span><<span class="pl-smi">String</span>> <span class="pl-s1">none</span> = <span class="pl-smi">Option</span>.<span class="pl-en">none</span>();</pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Try</h3><a id="user-content-try" class="anchor" aria-label="Permalink: Try" href="#try"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Is an implementation of scala <code>Try</code> in Java. It can contains two values, a <code>success</code> or a <code>failure</code>.</p> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="Try<String> success = Try.success("Hello world"); Try<String> failure = Try.failure(new RuntimeException("Error"));"><pre><span class="pl-smi">Try</span><<span class="pl-smi">String</span>> <span class="pl-s1">success</span> = <span class="pl-smi">Try</span>.<span class="pl-en">success</span>(<span class="pl-s">"Hello world"</span>); <span class="pl-smi">Try</span><<span class="pl-smi">String</span>> <span class="pl-s1">failure</span> = <span class="pl-smi">Try</span>.<span class="pl-en">failure</span>(<span class="pl-k">new</span> <span class="pl-smi">RuntimeException</span>(<span class="pl-s">"Error"</span>));</pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Either</h3><a id="user-content-either" class="anchor" aria-label="Permalink: Either" href="#either"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Is an implementation of scala <code>Either</code> in Java.</p> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="Either<Integer, String> right = Either.right("Hello world"); Either<Integer, String> left = Either.left(100);"><pre><span class="pl-smi">Either</span><<span class="pl-smi">Integer</span>, <span class="pl-smi">String</span>> <span class="pl-s1">right</span> = <span class="pl-smi">Either</span>.<span class="pl-en">right</span>(<span class="pl-s">"Hello world"</span>); <span class="pl-smi">Either</span><<span class="pl-smi">Integer</span>, <span class="pl-smi">String</span>> <span class="pl-s1">left</span> = <span class="pl-smi">Either</span>.<span class="pl-en">left</span>(<span class="pl-c1">100</span>);</pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Validation</h3><a id="user-content-validation" class="anchor" aria-label="Permalink: Validation" href="#validation"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">This type represents two different states, valid or invalid, an also it allows to combine several validations using <code>mapN</code> methods.</p> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="Validation<String, String> name = Validation.valid("John Smith"); Validation<String, String> email = Validation.valid("john.smith@example.net"); // Person has a constructor with two String parameters, name and email. Valdation<Sequence<String>, Person> person = Validation.map2(name, email, Person::new);"><pre><span class="pl-smi">Validation</span><<span class="pl-smi">String</span>, <span class="pl-smi">String</span>> <span class="pl-s1">name</span> = <span class="pl-smi">Validation</span>.<span class="pl-en">valid</span>(<span class="pl-s">"John Smith"</span>); <span class="pl-smi">Validation</span><<span class="pl-smi">String</span>, <span class="pl-smi">String</span>> <span class="pl-s1">email</span> = <span class="pl-smi">Validation</span>.<span class="pl-en">valid</span>(<span class="pl-s">"john.smith@example.net"</span>); <span class="pl-c">// Person has a constructor with two String parameters, name and email.</span> <span class="pl-smi">Valdation</span><<span class="pl-smi">Sequence</span><<span class="pl-smi">String</span>>, <span class="pl-smi">Person</span>> <span class="pl-s1">person</span> = <span class="pl-smi">Validation</span>.<span class="pl-en">map2</span>(<span class="pl-s1">name</span>, <span class="pl-s1">email</span>, <span class="pl-smi">Person</span>::<span class="pl-k">new</span>);</pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Const</h3><a id="user-content-const" class="anchor" aria-label="Permalink: Const" href="#const"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">A object with a phantom parameter:</p> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="Const<String, Integer> constInt = Const.of("Hello world!"); Const<String, Float> constFloat = constInt.retag(); assertEquals("Hello world!", constFloat.value());"><pre><span class="pl-smi">Const</span><<span class="pl-smi">String</span>, <span class="pl-smi">Integer</span>> <span class="pl-s1">constInt</span> = <span class="pl-smi">Const</span>.<span class="pl-en">of</span>(<span class="pl-s">"Hello world!"</span>); <span class="pl-smi">Const</span><<span class="pl-smi">String</span>, <span class="pl-smi">Float</span>> <span class="pl-s1">constFloat</span> = <span class="pl-s1">constInt</span>.<span class="pl-en">retag</span>(); <span class="pl-en">assertEquals</span>(<span class="pl-s">"Hello world!"</span>, <span class="pl-s1">constFloat</span>.<span class="pl-en">value</span>());</pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Future</h3><a id="user-content-future" class="anchor" aria-label="Permalink: Future" href="#future"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">This is an experimental implementation of Future. Computations are executed in another thread inmediatelly (since version 5.0 de default executor is a virtual thread per task executor).</p> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="Future<String> future = Future.success("Hello world!"); Future<String> result = future.flatMap(string -> Future.run(string::toUpperCase)); assertEquals(Try.success("HELLO WORLD!"), result.await());"><pre><span class="pl-smi">Future</span><<span class="pl-smi">String</span>> <span class="pl-s1">future</span> = <span class="pl-smi">Future</span>.<span class="pl-en">success</span>(<span class="pl-s">"Hello world!"</span>); <span class="pl-smi">Future</span><<span class="pl-smi">String</span>> <span class="pl-s1">result</span> = <span class="pl-s1">future</span>.<span class="pl-en">flatMap</span>(<span class="pl-s1">string</span> -> <span class="pl-smi">Future</span>.<span class="pl-en">run</span>(<span class="pl-s1">string</span>::<span class="pl-s1">toUpperCase</span>)); <span class="pl-en">assertEquals</span>(<span class="pl-smi">Try</span>.<span class="pl-en">success</span>(<span class="pl-s">"HELLO WORLD!"</span>), <span class="pl-s1">result</span>.<span class="pl-en">await</span>());</pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Trampoline</h3><a id="user-content-trampoline" class="anchor" aria-label="Permalink: Trampoline" href="#trampoline"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Implements recursion using an iteration and is stack safe.</p> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="private Trampoline<Integer> fibLoop(Integer n) { if (n < 2) { return Trampoline.done(n); } return Trampoline.more(() -> fibLoop(n - 1)).flatMap(x -> fibLoop(n - 2).map(y -> x + y)); }"><pre><span class="pl-k">private</span> <span class="pl-smi">Trampoline</span><<span class="pl-smi">Integer</span>> <span class="pl-en">fibLoop</span>(<span class="pl-smi">Integer</span> <span class="pl-s1">n</span>) { <span class="pl-k">if</span> (<span class="pl-s1">n</span> < <span class="pl-c1">2</span>) { <span class="pl-k">return</span> <span class="pl-smi">Trampoline</span>.<span class="pl-en">done</span>(<span class="pl-s1">n</span>); } <span class="pl-k">return</span> <span class="pl-smi">Trampoline</span>.<span class="pl-en">more</span>(() -> <span class="pl-en">fibLoop</span>(<span class="pl-s1">n</span> - <span class="pl-c1">1</span>)).<span class="pl-en">flatMap</span>(<span class="pl-s1">x</span> -> <span class="pl-en">fibLoop</span>(<span class="pl-s1">n</span> - <span class="pl-c1">2</span>).<span class="pl-en">map</span>(<span class="pl-s1">y</span> -> <span class="pl-s1">x</span> + <span class="pl-s1">y</span>)); }</pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Tuples</h3><a id="user-content-tuples" class="anchor" aria-label="Permalink: Tuples" href="#tuples"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">These classes allow to hold some values together, as tuples. There are tuples from 1 to 5.</p> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="Tuple1<String> tuple1 = Tuple.of("Hello world"); Tuple2<String, Integer> tuple2 = Tuple.of("John Smith", 100);"><pre><span class="pl-smi">Tuple1</span><<span class="pl-smi">String</span>> <span class="pl-s1">tuple1</span> = <span class="pl-smi">Tuple</span>.<span class="pl-en">of</span>(<span class="pl-s">"Hello world"</span>); <span class="pl-smi">Tuple2</span><<span class="pl-smi">String</span>, <span class="pl-smi">Integer</span>> <span class="pl-s1">tuple2</span> = <span class="pl-smi">Tuple</span>.<span class="pl-en">of</span>(<span class="pl-s">"John Smith"</span>, <span class="pl-c1">100</span>);</pre></div> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Data structures</h2><a id="user-content-data-structures" class="anchor" aria-label="Permalink: Data structures" href="#data-structures"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Java doesn't define immutable collections, so I have implemented some of them.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Sequence</h3><a id="user-content-sequence" class="anchor" aria-label="Permalink: Sequence" href="#sequence"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Is the equivalent to java <code>Collection</code> interface. It defines all the common methods. The default implementation use persistent collections based on <a href="https://github.com/hrldcpr/pcollections/">pcollections</a> library.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">ImmutableList</h3><a id="user-content-immutablelist" class="anchor" aria-label="Permalink: ImmutableList" href="#immutablelist"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">It represents a linked list. It has a head and a tail. Based on <code>ConsPStack</code>.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">ImmutableSet</h3><a id="user-content-immutableset" class="anchor" aria-label="Permalink: ImmutableSet" href="#immutableset"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">It represents a set of elements. This elements cannot be duplicated. Based on <code>HashTreePSet</code>.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">ImmutableArray</h3><a id="user-content-immutablearray" class="anchor" aria-label="Permalink: ImmutableArray" href="#immutablearray"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">It represents an array. You can access to the elements by its position in the array. Based on <code>TreePVector</code>.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">ImmutableMap</h3><a id="user-content-immutablemap" class="anchor" aria-label="Permalink: ImmutableMap" href="#immutablemap"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">This class represents a hash map. Based on <code>HashTreePMap</code>.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">ImmutableTree</h3><a id="user-content-immutabletree" class="anchor" aria-label="Permalink: ImmutableTree" href="#immutabletree"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">This class represents a binary tree. Based on <code>TreePSet</code></p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">ImmutableTreeMap</h3><a id="user-content-immutabletreemap" class="anchor" aria-label="Permalink: ImmutableTreeMap" href="#immutabletreemap"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">This class represents a binary tree map. Based on <code>TreePMap</code>.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Monads</h2><a id="user-content-monads" class="anchor" aria-label="Permalink: Monads" href="#monads"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Also I have implemented some Monads that allows to combine some operations.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">State Monad</h3><a id="user-content-state-monad" class="anchor" aria-label="Permalink: State Monad" href="#state-monad"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Is the traditional State Modad from FP languages, like Haskel or Scala. It allows to combine operations over a state. The state should be a immutable class. It recives an state and generates a tuple with the new state and an intermediate result.</p> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="State<ImmutableList<String>, Option<String>> read = State.state(list -> Tuple.of(list.tail(), list.head())); Tuple<ImmutableList<String>, Option<String>> result = read.run(ImmutableList.of("a", "b", "c")); assertEquals(Tuple.of(ImmutableList.of("b", "c"), Option.some("a")), result);"><pre><span class="pl-smi">State</span><<span class="pl-smi">ImmutableList</span><<span class="pl-smi">String</span>>, <span class="pl-smi">Option</span><<span class="pl-smi">String</span>>> <span class="pl-s1">read</span> = <span class="pl-smi">State</span>.<span class="pl-en">state</span>(<span class="pl-s1">list</span> -> <span class="pl-smi">Tuple</span>.<span class="pl-en">of</span>(<span class="pl-s1">list</span>.<span class="pl-en">tail</span>(), <span class="pl-s1">list</span>.<span class="pl-en">head</span>())); <span class="pl-smi">Tuple</span><<span class="pl-smi">ImmutableList</span><<span class="pl-smi">String</span>>, <span class="pl-smi">Option</span><<span class="pl-smi">String</span>>> <span class="pl-s1">result</span> = <span class="pl-s1">read</span>.<span class="pl-en">run</span>(<span class="pl-smi">ImmutableList</span>.<span class="pl-en">of</span>(<span class="pl-s">"a"</span>, <span class="pl-s">"b"</span>, <span class="pl-s">"c"</span>)); <span class="pl-en">assertEquals</span>(<span class="pl-smi">Tuple</span>.<span class="pl-en">of</span>(<span class="pl-smi">ImmutableList</span>.<span class="pl-en">of</span>(<span class="pl-s">"b"</span>, <span class="pl-s">"c"</span>), <span class="pl-smi">Option</span>.<span class="pl-en">some</span>(<span class="pl-s">"a"</span>)), <span class="pl-s1">result</span>);</pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Reader Monad</h3><a id="user-content-reader-monad" class="anchor" aria-label="Permalink: Reader Monad" href="#reader-monad"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">This is an implementation of Reader Monad. It allows to combine operations over a common input. It can be used to inject dependencies.</p> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="Reader<ImmutableList<String>, String> read2 = Reader.reader(list -> list.tail().head().orElse("")); String result = read2.eval(ImmutableList.of("a", "b", "c")); assertEqual("b", result);"><pre><span class="pl-smi">Reader</span><<span class="pl-smi">ImmutableList</span><<span class="pl-smi">String</span>>, <span class="pl-smi">String</span>> <span class="pl-s1">read2</span> = <span class="pl-smi">Reader</span>.<span class="pl-en">reader</span>(<span class="pl-s1">list</span> -> <span class="pl-s1">list</span>.<span class="pl-en">tail</span>().<span class="pl-en">head</span>().<span class="pl-en">orElse</span>(<span class="pl-s">""</span>)); <span class="pl-smi">String</span> <span class="pl-s1">result</span> = <span class="pl-s1">read2</span>.<span class="pl-en">eval</span>(<span class="pl-smi">ImmutableList</span>.<span class="pl-en">of</span>(<span class="pl-s">"a"</span>, <span class="pl-s">"b"</span>, <span class="pl-s">"c"</span>)); <span class="pl-en">assertEqual</span>(<span class="pl-s">"b"</span>, <span class="pl-s1">result</span>);</pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Writer Monad</h3><a id="user-content-writer-monad" class="anchor" aria-label="Permalink: Writer Monad" href="#writer-monad"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">It allow to combine operations over a common output.</p> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="Writer<ImmutableList<String>, Integer> writer = Writer.<String, Integer>listPure(5) .flatMap(value -> listWriter("add 5", value + 5)) .flatMap(value -> listWriter("plus 2", value * 2)); assertAll(() -> assertEquals(Integer.valueOf(20), writer.getValue()), () -> assertEquals(listOf("add 5", "plus 2"), writer.getLog()));"><pre><span class="pl-smi">Writer</span><<span class="pl-smi">ImmutableList</span><<span class="pl-smi">String</span>>, <span class="pl-smi">Integer</span>> <span class="pl-s1">writer</span> = <span class="pl-smi">Writer</span>.<<span class="pl-smi">String</span>, <span class="pl-smi">Integer</span>><span class="pl-en">listPure</span>(<span class="pl-c1">5</span>) .<span class="pl-en">flatMap</span>(<span class="pl-s1">value</span> -> <span class="pl-en">listWriter</span>(<span class="pl-s">"add 5"</span>, <span class="pl-s1">value</span> + <span class="pl-c1">5</span>)) .<span class="pl-en">flatMap</span>(<span class="pl-s1">value</span> -> <span class="pl-en">listWriter</span>(<span class="pl-s">"plus 2"</span>, <span class="pl-s1">value</span> * <span class="pl-c1">2</span>)); <span class="pl-en">assertAll</span>(() -> <span class="pl-en">assertEquals</span>(<span class="pl-smi">Integer</span>.<span class="pl-en">valueOf</span>(<span class="pl-c1">20</span>), <span class="pl-s1">writer</span>.<span class="pl-en">getValue</span>()), () -> <span class="pl-en">assertEquals</span>(<span class="pl-en">listOf</span>(<span class="pl-s">"add 5"</span>, <span class="pl-s">"plus 2"</span>), <span class="pl-s1">writer</span>.<span class="pl-en">getLog</span>()));</pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">IO Monad</h3><a id="user-content-io-monad" class="anchor" aria-label="Permalink: IO Monad" href="#io-monad"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">This is a experimental implementation of IO Monad in java. Inspired in this <a href="https://gist.github.com/joergrathlev/f17092d3470dcf732be6">work</a>.</p> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="IO<Unit> echo = Console.print("write your name") .andThen(Console.read()) .flatMap(name -> Console.print("Hello " + name)) .andThen(Console.print("end")); echo.unsafeRunSync();"><pre><span class="pl-smi">IO</span><<span class="pl-smi">Unit</span>> <span class="pl-s1">echo</span> = <span class="pl-smi">Console</span>.<span class="pl-en">print</span>(<span class="pl-s">"write your name"</span>) .<span class="pl-en">andThen</span>(<span class="pl-smi">Console</span>.<span class="pl-en">read</span>()) .<span class="pl-en">flatMap</span>(<span class="pl-s1">name</span> -> <span class="pl-smi">Console</span>.<span class="pl-en">print</span>(<span class="pl-s">"Hello "</span> + <span class="pl-s1">name</span>)) .<span class="pl-en">andThen</span>(<span class="pl-smi">Console</span>.<span class="pl-en">print</span>(<span class="pl-s">"end"</span>)); <span class="pl-s1">echo</span>.<span class="pl-en">unsafeRunSync</span>();</pre></div> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Free</h2><a id="user-content-free" class="anchor" aria-label="Permalink: Free" href="#free"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Free Monad</h3><a id="user-content-free-monad" class="anchor" aria-label="Permalink: Free Monad" href="#free-monad"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Finally, after hours of hard coding, I managed to implement a Free monad. This is a highly unstable implementation and I have implemented because it can be implemented. Inspired in this <a href="https://github.com/xuwei-k/free-monad-java">work</a>.</p> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="Free<IOProgram_, Unit> echo = IOProgram.write("what's your name?") .andThen(IOProgram.read()) .flatMap(text -> IOProgram.write("Hello " + text)) .andThen(IOProgram.write("end")); Kind<IO_, Unit> foldMap = echo.foldMap(IOInstances.monad(), new IOProgramInterperter()); foldMap.fix(toIO()).unsafeRunSync();"><pre><span class="pl-smi">Free</span><<span class="pl-smi">IOProgram_</span>, <span class="pl-smi">Unit</span>> <span class="pl-s1">echo</span> = <span class="pl-smi">IOProgram</span>.<span class="pl-en">write</span>(<span class="pl-s">"what's your name?"</span>) .<span class="pl-en">andThen</span>(<span class="pl-smi">IOProgram</span>.<span class="pl-en">read</span>()) .<span class="pl-en">flatMap</span>(<span class="pl-s1">text</span> -> <span class="pl-smi">IOProgram</span>.<span class="pl-en">write</span>(<span class="pl-s">"Hello "</span> + <span class="pl-s1">text</span>)) .<span class="pl-en">andThen</span>(<span class="pl-smi">IOProgram</span>.<span class="pl-en">write</span>(<span class="pl-s">"end"</span>)); <span class="pl-smi">Kind</span><<span class="pl-smi">IO_</span>, <span class="pl-smi">Unit</span>> <span class="pl-s1">foldMap</span> = <span class="pl-s1">echo</span>.<span class="pl-en">foldMap</span>(<span class="pl-smi">IOInstances</span>.<span class="pl-en">monad</span>(), <span class="pl-k">new</span> <span class="pl-smi">IOProgramInterperter</span>()); <span class="pl-s1">foldMap</span>.<span class="pl-en">fix</span>(<span class="pl-en">toIO</span>()).<span class="pl-en">unsafeRunSync</span>();</pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Free Applicative</h3><a id="user-content-free-applicative" class="anchor" aria-label="Permalink: Free Applicative" href="#free-applicative"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Similar to Free monad, but allows static analysis without to run the program.</p> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="FreeAp<DSL_, Tuple5<Integer, Boolean, Double, String, Unit>> tuple = applicative.map5( DSL.readInt(2), DSL.readBoolean(false), DSL.readDouble(2.1), DSL.readString("hola mundo"), DSL.readUnit(), Tuple::of ).fix(toFreeAp()); Kind<Id_, Tuple5<Integer, Boolean, Double, String, Unit>> map = tuple.foldMap(idTransform(), IdInstances.applicative()); assertEquals(Id.of(Tuple.of(2, false, 2.1, "hola mundo", unit())), map.fix(toId()));"><pre><span class="pl-smi">FreeAp</span><<span class="pl-smi">DSL_</span>, <span class="pl-smi">Tuple5</span><<span class="pl-smi">Integer</span>, <span class="pl-smi">Boolean</span>, <span class="pl-smi">Double</span>, <span class="pl-smi">String</span>, <span class="pl-smi">Unit</span>>> <span class="pl-s1">tuple</span> = <span class="pl-s1">applicative</span>.<span class="pl-en">map5</span>( <span class="pl-c1">DSL</span>.<span class="pl-en">readInt</span>(<span class="pl-c1">2</span>), <span class="pl-c1">DSL</span>.<span class="pl-en">readBoolean</span>(<span class="pl-c1">false</span>), <span class="pl-c1">DSL</span>.<span class="pl-en">readDouble</span>(<span class="pl-c1">2.1</span>), <span class="pl-c1">DSL</span>.<span class="pl-en">readString</span>(<span class="pl-s">"hola mundo"</span>), <span class="pl-c1">DSL</span>.<span class="pl-en">readUnit</span>(), <span class="pl-smi">Tuple</span>::<span class="pl-s1">of</span> ).<span class="pl-en">fix</span>(<span class="pl-en">toFreeAp</span>()); <span class="pl-smi">Kind</span><<span class="pl-smi">Id_</span>, <span class="pl-smi">Tuple5</span><<span class="pl-smi">Integer</span>, <span class="pl-smi">Boolean</span>, <span class="pl-smi">Double</span>, <span class="pl-smi">String</span>, <span class="pl-smi">Unit</span>>> <span class="pl-s1">map</span> = <span class="pl-s1">tuple</span>.<span class="pl-en">foldMap</span>(<span class="pl-en">idTransform</span>(), <span class="pl-smi">IdInstances</span>.<span class="pl-en">applicative</span>()); <span class="pl-en">assertEquals</span>(<span class="pl-smi">Id</span>.<span class="pl-en">of</span>(<span class="pl-smi">Tuple</span>.<span class="pl-en">of</span>(<span class="pl-c1">2</span>, <span class="pl-c1">false</span>, <span class="pl-c1">2.1</span>, <span class="pl-s">"hola mundo"</span>, <span class="pl-en">unit</span>())), <span class="pl-s1">map</span>.<span class="pl-en">fix</span>(<span class="pl-en">toId</span>()));</pre></div> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Monad Transformers</h2><a id="user-content-monad-transformers" class="anchor" aria-label="Permalink: Monad Transformers" href="#monad-transformers"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">OptionT</h3><a id="user-content-optiont" class="anchor" aria-label="Permalink: OptionT" href="#optiont"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Monad Transformer for <code>Option</code> type</p> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="OptionT<IO_, String> some = OptionT.some(IO.monad(), "abc"); OptionT<IO_, String> map = some.flatMap(value -> OptionT.some(IOInstances.monad(), value.toUpperCase())); assertEquals("ABC", map.get().fix(toIO()).unsafeRunSync());"><pre><span class="pl-smi">OptionT</span><<span class="pl-smi">IO_</span>, <span class="pl-smi">String</span>> <span class="pl-s1">some</span> = <span class="pl-smi">OptionT</span>.<span class="pl-en">some</span>(<span class="pl-c1">IO</span>.<span class="pl-en">monad</span>(), <span class="pl-s">"abc"</span>); <span class="pl-smi">OptionT</span><<span class="pl-smi">IO_</span>, <span class="pl-smi">String</span>> <span class="pl-s1">map</span> = <span class="pl-s1">some</span>.<span class="pl-en">flatMap</span>(<span class="pl-s1">value</span> -> <span class="pl-smi">OptionT</span>.<span class="pl-en">some</span>(<span class="pl-smi">IOInstances</span>.<span class="pl-en">monad</span>(), <span class="pl-s1">value</span>.<span class="pl-en">toUpperCase</span>())); <span class="pl-en">assertEquals</span>(<span class="pl-s">"ABC"</span>, <span class="pl-s1">map</span>.<span class="pl-en">get</span>().<span class="pl-en">fix</span>(<span class="pl-en">toIO</span>()).<span class="pl-en">unsafeRunSync</span>());</pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">EitherT</h3><a id="user-content-eithert" class="anchor" aria-label="Permalink: EitherT" href="#eithert"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Monad Transformer for <code>Either</code> type</p> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="EitherT<IO_, Nothing, String> right = EitherT.right(IO.monad(), "abc"); EitherT<IO_, Nothing, String> map = right.flatMap(value -> EitherT.right(IOInstances.monad(), value.toUpperCase())); assertEquals("ABC", map.get().fix(toIO()).unsafeRunSync());"><pre><span class="pl-smi">EitherT</span><<span class="pl-smi">IO_</span>, <span class="pl-smi">Nothing</span>, <span class="pl-smi">String</span>> <span class="pl-s1">right</span> = <span class="pl-smi">EitherT</span>.<span class="pl-en">right</span>(<span class="pl-c1">IO</span>.<span class="pl-en">monad</span>(), <span class="pl-s">"abc"</span>); <span class="pl-smi">EitherT</span><<span class="pl-smi">IO_</span>, <span class="pl-smi">Nothing</span>, <span class="pl-smi">String</span>> <span class="pl-s1">map</span> = <span class="pl-s1">right</span>.<span class="pl-en">flatMap</span>(<span class="pl-s1">value</span> -> <span class="pl-smi">EitherT</span>.<span class="pl-en">right</span>(<span class="pl-smi">IOInstances</span>.<span class="pl-en">monad</span>(), <span class="pl-s1">value</span>.<span class="pl-en">toUpperCase</span>())); <span class="pl-en">assertEquals</span>(<span class="pl-s">"ABC"</span>, <span class="pl-s1">map</span>.<span class="pl-en">get</span>().<span class="pl-en">fix</span>(<span class="pl-en">toIO</span>()).<span class="pl-en">unsafeRunSync</span>());</pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">StateT</h3><a id="user-content-statet" class="anchor" aria-label="Permalink: StateT" href="#statet"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Monad Transformer for <code>State</code> type</p> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="StateT<IO_, ImmutableList<String>, Unit> state = pure("a").flatMap(append("b")).flatMap(append("c")).flatMap(end()); IO<Tuple2<ImmutableList<String>, Unit>> result = state.run(ImmutableList.empty()).fix(toIO()); assertEquals(Tuple.of(listOf("a", "b", "c"), unit()), result.unsafeRunSync());"><pre><span class="pl-smi">StateT</span><<span class="pl-smi">IO_</span>, <span class="pl-smi">ImmutableList</span><<span class="pl-smi">String</span>>, <span class="pl-smi">Unit</span>> <span class="pl-s1">state</span> = <span class="pl-en">pure</span>(<span class="pl-s">"a"</span>).<span class="pl-en">flatMap</span>(<span class="pl-en">append</span>(<span class="pl-s">"b"</span>)).<span class="pl-en">flatMap</span>(<span class="pl-en">append</span>(<span class="pl-s">"c"</span>)).<span class="pl-en">flatMap</span>(<span class="pl-en">end</span>()); <span class="pl-smi">IO</span><<span class="pl-smi">Tuple2</span><<span class="pl-smi">ImmutableList</span><<span class="pl-smi">String</span>>, <span class="pl-smi">Unit</span>>> <span class="pl-s1">result</span> = <span class="pl-s1">state</span>.<span class="pl-en">run</span>(<span class="pl-smi">ImmutableList</span>.<span class="pl-en">empty</span>()).<span class="pl-en">fix</span>(<span class="pl-en">toIO</span>()); <span class="pl-en">assertEquals</span>(<span class="pl-smi">Tuple</span>.<span class="pl-en">of</span>(<span class="pl-en">listOf</span>(<span class="pl-s">"a"</span>, <span class="pl-s">"b"</span>, <span class="pl-s">"c"</span>), <span class="pl-en">unit</span>()), <span class="pl-s1">result</span>.<span class="pl-en">unsafeRunSync</span>());</pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">WriterT</h3><a id="user-content-writert" class="anchor" aria-label="Permalink: WriterT" href="#writert"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Monad Transformer for <code>Writer</code> type</p> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="WriterT<Id_, Sequence<String>, Integer> writer = WriterT.<Id_, Sequence<String>, Integer>pure(monoid, monad, 5) .flatMap(value -> lift(monoid, monad, Tuple.of(listOf("add 5"), value + 5))) .flatMap(value -> lift(monoid, monad, Tuple.of(listOf("plus 2"), value * 2))); assertAll(() -> assertEquals(Id.of(Integer.valueOf(20)), writer.getValue()), () -> assertEquals(Id.of(listOf("add 5", "plus 2")), writer.getLog()));"><pre><span class="pl-smi">WriterT</span><<span class="pl-smi">Id_</span>, <span class="pl-smi">Sequence</span><<span class="pl-smi">String</span>>, <span class="pl-smi">Integer</span>> <span class="pl-s1">writer</span> = <span class="pl-smi">WriterT</span>.<<span class="pl-smi">Id_</span>, <span class="pl-smi">Sequence</span><<span class="pl-smi">String</span>>, <span class="pl-smi">Integer</span>><span class="pl-en">pure</span>(<span class="pl-s1">monoid</span>, <span class="pl-s1">monad</span>, <span class="pl-c1">5</span>) .<span class="pl-en">flatMap</span>(<span class="pl-s1">value</span> -> <span class="pl-en">lift</span>(<span class="pl-s1">monoid</span>, <span class="pl-s1">monad</span>, <span class="pl-smi">Tuple</span>.<span class="pl-en">of</span>(<span class="pl-en">listOf</span>(<span class="pl-s">"add 5"</span>), <span class="pl-s1">value</span> + <span class="pl-c1">5</span>))) .<span class="pl-en">flatMap</span>(<span class="pl-s1">value</span> -> <span class="pl-en">lift</span>(<span class="pl-s1">monoid</span>, <span class="pl-s1">monad</span>, <span class="pl-smi">Tuple</span>.<span class="pl-en">of</span>(<span class="pl-en">listOf</span>(<span class="pl-s">"plus 2"</span>), <span class="pl-s1">value</span> * <span class="pl-c1">2</span>))); <span class="pl-en">assertAll</span>(() -> <span class="pl-en">assertEquals</span>(<span class="pl-smi">Id</span>.<span class="pl-en">of</span>(<span class="pl-smi">Integer</span>.<span class="pl-en">valueOf</span>(<span class="pl-c1">20</span>)), <span class="pl-s1">writer</span>.<span class="pl-en">getValue</span>()), () -> <span class="pl-en">assertEquals</span>(<span class="pl-smi">Id</span>.<span class="pl-en">of</span>(<span class="pl-en">listOf</span>(<span class="pl-s">"add 5"</span>, <span class="pl-s">"plus 2"</span>)), <span class="pl-s1">writer</span>.<span class="pl-en">getLog</span>()));</pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Kleisli</h3><a id="user-content-kleisli" class="anchor" aria-label="Permalink: Kleisli" href="#kleisli"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Also I implemented the Kleisli composition for functions that returns monadic values like <code>Option</code>, <code>Try</code> or <code>Either</code>.</p> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="Kleisli<Try_, String, Integer> toInt = Kleisli.lift(Try.monad(), Integer::parseInt); Kleisli<Try_, Integer, Double> half = Kleisli.lift(Try.monad(), i -> i / 2.); Kind<Try_, Double> result = toInt.compose(half).run("123"); assertEquals(Try.success(61.5), result);"><pre><span class="pl-smi">Kleisli</span><<span class="pl-smi">Try_</span>, <span class="pl-smi">String</span>, <span class="pl-smi">Integer</span>> <span class="pl-s1">toInt</span> = <span class="pl-smi">Kleisli</span>.<span class="pl-en">lift</span>(<span class="pl-smi">Try</span>.<span class="pl-en">monad</span>(), <span class="pl-smi">Integer</span>::<span class="pl-s1">parseInt</span>); <span class="pl-smi">Kleisli</span><<span class="pl-smi">Try_</span>, <span class="pl-smi">Integer</span>, <span class="pl-smi">Double</span>> <span class="pl-s1">half</span> = <span class="pl-smi">Kleisli</span>.<span class="pl-en">lift</span>(<span class="pl-smi">Try</span>.<span class="pl-en">monad</span>(), <span class="pl-s1">i</span> -> <span class="pl-s1">i</span> / <span class="pl-c1">2.</span>); <span class="pl-smi">Kind</span><<span class="pl-smi">Try_</span>, <span class="pl-smi">Double</span>> <span class="pl-s1">result</span> = <span class="pl-s1">toInt</span>.<span class="pl-en">compose</span>(<span class="pl-s1">half</span>).<span class="pl-en">run</span>(<span class="pl-s">"123"</span>); <span class="pl-en">assertEquals</span>(<span class="pl-smi">Try</span>.<span class="pl-en">success</span>(<span class="pl-c1">61.5</span>), <span class="pl-s1">result</span>);</pre></div> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Stream</h2><a id="user-content-stream" class="anchor" aria-label="Permalink: Stream" href="#stream"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">An experimental version of a <code>Stream</code> like scala fs2 project.</p> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="StreamOf<IO<?>> streamOfIO = Stream.ofIO(); IO<String> readFile = streamOfIO.eval(IO.of(() -> reader(file))) .flatMap(reader -> streamOfIO.iterate(() -> Option.of(() -> readLine(reader)))) .takeWhile(Option::isPresent) .map(Option::get) .foldLeft("", (a, b) -> a + "\n" + b) .fix(IOOf::toIO) .recoverWith(UncheckedIOException.class, cons("--- file not found ---")); String content = readFile.unsafeRunSync();"><pre><span class="pl-smi">StreamOf</span><<span class="pl-smi">IO</span><?>> <span class="pl-s1">streamOfIO</span> = <span class="pl-smi">Stream</span>.<span class="pl-en">ofIO</span>(); <span class="pl-smi">IO</span><<span class="pl-smi">String</span>> <span class="pl-s1">readFile</span> = <span class="pl-s1">streamOfIO</span>.<span class="pl-en">eval</span>(<span class="pl-c1">IO</span>.<span class="pl-en">of</span>(() -> <span class="pl-en">reader</span>(<span class="pl-s1">file</span>))) .<span class="pl-en">flatMap</span>(<span class="pl-s1">reader</span> -> <span class="pl-s1">streamOfIO</span>.<span class="pl-en">iterate</span>(() -> <span class="pl-smi">Option</span>.<span class="pl-en">of</span>(() -> <span class="pl-en">readLine</span>(<span class="pl-s1">reader</span>)))) .<span class="pl-en">takeWhile</span>(<span class="pl-smi">Option</span>::<span class="pl-s1">isPresent</span>) .<span class="pl-en">map</span>(<span class="pl-smi">Option</span>::<span class="pl-s1">get</span>) .<span class="pl-en">foldLeft</span>(<span class="pl-s">""</span>, (<span class="pl-s1">a</span>, <span class="pl-s1">b</span>) -> <span class="pl-s1">a</span> + <span class="pl-s">"<span class="pl-cce">\n</span>"</span> + <span class="pl-s1">b</span>) .<span class="pl-en">fix</span>(<span class="pl-smi">IOOf</span>::<span class="pl-s1">toIO</span>) .<span class="pl-en">recoverWith</span>(<span class="pl-smi">UncheckedIOException</span>.<span class="pl-k">class</span>, <span class="pl-en">cons</span>(<span class="pl-s">"--- file not found ---"</span>)); <span class="pl-smi">String</span> <span class="pl-s1">content</span> = <span class="pl-s1">readFile</span>.<span class="pl-en">unsafeRunSync</span>();</pre></div> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Effects</h2><a id="user-content-effects" class="anchor" aria-label="Permalink: Effects" href="#effects"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">An experimental version of <code>PureIO</code> similar to ZIO.</p> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="PureIO<Console, Throwable, Unit> echoProgram = Console.println("what's your name?") .andThen(Console.readln()) .flatMap(name -> Console.println("Hello " + name)); interface Console { <R extends Console> Console.Service<R> console(); static PureIO<Console, Throwable, String> readln() { return PureIO.accessM(env -> env.console().readln()); } static PureIO<Console, Throwable, Unit> println(String text) { return PureIO.accessM(env -> env.console().println(text)); } interface Service<R extends Console> { PureIO<R, Throwable, String> readln(); PureIO<R, Throwable, Unit> println(String text); } }"><pre><span class="pl-smi">PureIO</span><<span class="pl-smi">Console</span>, <span class="pl-smi">Throwable</span>, <span class="pl-smi">Unit</span>> <span class="pl-s1">echoProgram</span> = <span class="pl-smi">Console</span>.<span class="pl-en">println</span>(<span class="pl-s">"what's your name?"</span>) .<span class="pl-en">andThen</span>(<span class="pl-smi">Console</span>.<span class="pl-en">readln</span>()) .<span class="pl-en">flatMap</span>(<span class="pl-s1">name</span> -> <span class="pl-smi">Console</span>.<span class="pl-en">println</span>(<span class="pl-s">"Hello "</span> + <span class="pl-s1">name</span>)); <span class="pl-k">interface</span> <span class="pl-smi">Console</span> { <<span class="pl-smi">R</span> <span class="pl-k">extends</span> <span class="pl-smi">Console</span>> <span class="pl-smi">Console</span>.<span class="pl-smi">Service</span><<span class="pl-smi">R</span>> <span class="pl-en">console</span>(); <span class="pl-k">static</span> <span class="pl-smi">PureIO</span><<span class="pl-smi">Console</span>, <span class="pl-smi">Throwable</span>, <span class="pl-smi">String</span>> <span class="pl-en">readln</span>() { <span class="pl-k">return</span> <span class="pl-smi">PureIO</span>.<span class="pl-en">accessM</span>(<span class="pl-s1">env</span> -> <span class="pl-s1">env</span>.<span class="pl-en">console</span>().<span class="pl-en">readln</span>()); } <span class="pl-k">static</span> <span class="pl-smi">PureIO</span><<span class="pl-smi">Console</span>, <span class="pl-smi">Throwable</span>, <span class="pl-smi">Unit</span>> <span class="pl-en">println</span>(<span class="pl-smi">String</span> <span class="pl-s1">text</span>) { <span class="pl-k">return</span> <span class="pl-smi">PureIO</span>.<span class="pl-en">accessM</span>(<span class="pl-s1">env</span> -> <span class="pl-s1">env</span>.<span class="pl-en">console</span>().<span class="pl-en">println</span>(<span class="pl-s1">text</span>)); } <span class="pl-k">interface</span> <span class="pl-smi">Service</span><<span class="pl-smi">R</span> <span class="pl-k">extends</span> <span class="pl-smi">Console</span>> { <span class="pl-smi">PureIO</span><<span class="pl-smi">R</span>, <span class="pl-smi">Throwable</span>, <span class="pl-smi">String</span>> <span class="pl-en">readln</span>(); <span class="pl-smi">PureIO</span><<span class="pl-smi">R</span>, <span class="pl-smi">Throwable</span>, <span class="pl-smi">Unit</span>> <span class="pl-en">println</span>(<span class="pl-smi">String</span> <span class="pl-s1">text</span>); } }</pre></div> <p dir="auto">Additionally, there are aliases for some PureIO special cases:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="UIO<T> => PureIO<Void, Void, T> EIO<E, T> => PureIO<Void, E, T> Task<T> => PureIO<Void, Throwable, T> RIO<R, T> => PureIO<R, Throwable, T> URIO<T> => PureIO<R, Void, T>"><pre class="notranslate"><code>UIO<T> => PureIO<Void, Void, T> EIO<E, T> => PureIO<Void, E, T> Task<T> => PureIO<Void, Throwable, T> RIO<R, T> => PureIO<R, Throwable, T> URIO<T> => PureIO<R, Void, T> </code></pre></div> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Type Classes</h2><a id="user-content-type-classes" class="anchor" aria-label="Permalink: Type Classes" href="#type-classes"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">With higher kinded types simulation we can implement typeclases.</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content=" Invariant -- Contravariant \ SemigroupK Functor -- Comonad | / \ MonoidK _ Applicative Traverse -- Foldable | / | \ Alternative Selective ApplicativeError | | MonadWriter Monad | \________________| | / / \ / MonadState MonadReader MonadError_____ \ \ MonadThrow Bracket \ / Defer -- MonadDefer -- Timer | Async | Concurrent"><pre class="notranslate"><code> Invariant -- Contravariant \ SemigroupK Functor -- Comonad | / \ MonoidK _ Applicative Traverse -- Foldable | / | \ Alternative Selective ApplicativeError | | MonadWriter Monad | \________________| | / / \ / MonadState MonadReader MonadError_____ \ \ MonadThrow Bracket \ / Defer -- MonadDefer -- Timer | Async | Concurrent </code></pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Functor</h3><a id="user-content-functor" class="anchor" aria-label="Permalink: Functor" href="#functor"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="public interface Functor<F extends > extends Invariant<F> { <T, R> Kind<F, R> map(Kind<F, T> value, Function1<T, R> map); }"><pre><span class="pl-k">public</span> <span class="pl-k">interface</span> <span class="pl-smi">Functor</span><<span class="pl-smi">F</span> <span class="pl-k">extends</span> > <span class="pl-k">extends</span> <span class="pl-smi">Invariant</span><<span class="pl-smi">F</span>> { <<span class="pl-smi">T</span>, <span class="pl-smi">R</span>> <span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">R</span>> <span class="pl-en">map</span>(<span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">T</span>> <span class="pl-s1">value</span>, <span class="pl-smi">Function1</span><<span class="pl-smi">T</span>, <span class="pl-smi">R</span>> <span class="pl-s1">map</span>); }</pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Applicative</h3><a id="user-content-applicative" class="anchor" aria-label="Permalink: Applicative" href="#applicative"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="public interface Applicative<F> extends Functor<F> { <T> Kind<F, T> pure(T value); <T, R> Kind<F, R> ap(Kind<F, T> value, Kind<F, Function1<T, R>> apply); @Override default <T, R> Kind<F, R> map(Kind<F, T> value, Function1<T, R> map) { return ap(value, pure(map)); } }"><pre><span class="pl-k">public</span> <span class="pl-k">interface</span> <span class="pl-smi">Applicative</span><<span class="pl-smi">F</span>> <span class="pl-k">extends</span> <span class="pl-smi">Functor</span><<span class="pl-smi">F</span>> { <<span class="pl-smi">T</span>> <span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">T</span>> <span class="pl-en">pure</span>(<span class="pl-smi">T</span> <span class="pl-s1">value</span>); <<span class="pl-smi">T</span>, <span class="pl-smi">R</span>> <span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">R</span>> <span class="pl-en">ap</span>(<span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">T</span>> <span class="pl-s1">value</span>, <span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">Function1</span><<span class="pl-smi">T</span>, <span class="pl-smi">R</span>>> <span class="pl-s1">apply</span>); <span class="pl-c1">@</span><span class="pl-c1">Override</span> <span class="pl-k">default</span> <<span class="pl-smi">T</span>, <span class="pl-smi">R</span>> <span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">R</span>> <span class="pl-en">map</span>(<span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">T</span>> <span class="pl-s1">value</span>, <span class="pl-smi">Function1</span><<span class="pl-smi">T</span>, <span class="pl-smi">R</span>> <span class="pl-s1">map</span>) { <span class="pl-k">return</span> <span class="pl-en">ap</span>(<span class="pl-s1">value</span>, <span class="pl-en">pure</span>(<span class="pl-s1">map</span>)); } }</pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Selective</h3><a id="user-content-selective" class="anchor" aria-label="Permalink: Selective" href="#selective"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="public interface Selective<F> extends Applicative<F> { <A, B> Kind<F, B> select(Kind<F, Either<A, B>> value, Kind<F, Function1<A, B>> apply); default <A, B, C> Kind<F, C> branch(Kind<F, Either<A, B>> value, Kind<F, Function1<A, C>> applyA, Kind<F, Function1<B, C>> applyB) { Kind<F, Either<A, Either<B, C>>> abc = map(value, either -> either.map(Either::left)); Kind<F, Function1<A, Either<B, C>>> fabc = map(applyA, fb -> fb.andThen(Either::right)); return select(select(abc, fabc), applyB); } }"><pre><span class="pl-k">public</span> <span class="pl-k">interface</span> <span class="pl-smi">Selective</span><<span class="pl-smi">F</span>> <span class="pl-k">extends</span> <span class="pl-smi">Applicative</span><<span class="pl-smi">F</span>> { <<span class="pl-smi">A</span>, <span class="pl-smi">B</span>> <span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">B</span>> <span class="pl-en">select</span>(<span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">Either</span><<span class="pl-smi">A</span>, <span class="pl-smi">B</span>>> <span class="pl-s1">value</span>, <span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">Function1</span><<span class="pl-smi">A</span>, <span class="pl-smi">B</span>>> <span class="pl-s1">apply</span>); <span class="pl-k">default</span> <<span class="pl-smi">A</span>, <span class="pl-smi">B</span>, <span class="pl-smi">C</span>> <span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">C</span>> <span class="pl-en">branch</span>(<span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">Either</span><<span class="pl-smi">A</span>, <span class="pl-smi">B</span>>> <span class="pl-s1">value</span>, <span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">Function1</span><<span class="pl-smi">A</span>, <span class="pl-smi">C</span>>> <span class="pl-s1">applyA</span>, <span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">Function1</span><<span class="pl-smi">B</span>, <span class="pl-smi">C</span>>> <span class="pl-s1">applyB</span>) { <span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">Either</span><<span class="pl-smi">A</span>, <span class="pl-smi">Either</span><<span class="pl-smi">B</span>, <span class="pl-smi">C</span>>>> <span class="pl-s1">abc</span> = <span class="pl-en">map</span>(<span class="pl-s1">value</span>, <span class="pl-s1">either</span> -> <span class="pl-s1">either</span>.<span class="pl-en">map</span>(<span class="pl-smi">Either</span>::<span class="pl-s1">left</span>)); <span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">Function1</span><<span class="pl-smi">A</span>, <span class="pl-smi">Either</span><<span class="pl-smi">B</span>, <span class="pl-smi">C</span>>>> <span class="pl-s1">fabc</span> = <span class="pl-en">map</span>(<span class="pl-s1">applyA</span>, <span class="pl-s1">fb</span> -> <span class="pl-s1">fb</span>.<span class="pl-en">andThen</span>(<span class="pl-smi">Either</span>::<span class="pl-s1">right</span>)); <span class="pl-k">return</span> <span class="pl-en">select</span>(<span class="pl-en">select</span>(<span class="pl-s1">abc</span>, <span class="pl-s1">fabc</span>), <span class="pl-s1">applyB</span>); } }</pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Monad</h3><a id="user-content-monad" class="anchor" aria-label="Permalink: Monad" href="#monad"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="public interface Monad<F> extends Selective<F> { <T, R> Kind<F, R> flatMap(Kind<F, T> value, Function1<T, ? extends Kind<F, R>> map); @Override default <T, R> Kind<F, R> map(Kind<F, T> value, Function1<T, R> map) { return flatMap(value, map.andThen(this::pure)); } @Override default <T, R> Kind<F, R> ap(Kind<F, T> value, Kind<F, Function1<T, R>> apply) { return flatMap(apply, map -> map(value, map)); } @Override default <A, B> Kind<F, B> select(Kind<F, Either<A, B>> value, Kind<F, Function1<A, B>> apply) { return flatMap(value, either -> either.fold(a -> map(apply, map -> map.apply(a)), this::<B>pure)); } }"><pre><span class="pl-k">public</span> <span class="pl-k">interface</span> <span class="pl-smi">Monad</span><<span class="pl-smi">F</span>> <span class="pl-k">extends</span> <span class="pl-smi">Selective</span><<span class="pl-smi">F</span>> { <<span class="pl-smi">T</span>, <span class="pl-smi">R</span>> <span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">R</span>> <span class="pl-en">flatMap</span>(<span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">T</span>> <span class="pl-s1">value</span>, <span class="pl-smi">Function1</span><<span class="pl-smi">T</span>, ? <span class="pl-k">extends</span> <span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">R</span>>> <span class="pl-s1">map</span>); <span class="pl-c1">@</span><span class="pl-c1">Override</span> <span class="pl-k">default</span> <<span class="pl-smi">T</span>, <span class="pl-smi">R</span>> <span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">R</span>> <span class="pl-en">map</span>(<span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">T</span>> <span class="pl-s1">value</span>, <span class="pl-smi">Function1</span><<span class="pl-smi">T</span>, <span class="pl-smi">R</span>> <span class="pl-s1">map</span>) { <span class="pl-k">return</span> <span class="pl-en">flatMap</span>(<span class="pl-s1">value</span>, <span class="pl-s1">map</span>.<span class="pl-en">andThen</span>(<span class="pl-smi">this</span>::<span class="pl-s1">pure</span>)); } <span class="pl-c1">@</span><span class="pl-c1">Override</span> <span class="pl-k">default</span> <<span class="pl-smi">T</span>, <span class="pl-smi">R</span>> <span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">R</span>> <span class="pl-en">ap</span>(<span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">T</span>> <span class="pl-s1">value</span>, <span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">Function1</span><<span class="pl-smi">T</span>, <span class="pl-smi">R</span>>> <span class="pl-s1">apply</span>) { <span class="pl-k">return</span> <span class="pl-en">flatMap</span>(<span class="pl-s1">apply</span>, <span class="pl-s1">map</span> -> <span class="pl-en">map</span>(<span class="pl-s1">value</span>, <span class="pl-s1">map</span>)); } <span class="pl-c1">@</span><span class="pl-c1">Override</span> <span class="pl-k">default</span> <<span class="pl-smi">A</span>, <span class="pl-smi">B</span>> <span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">B</span>> <span class="pl-en">select</span>(<span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">Either</span><<span class="pl-smi">A</span>, <span class="pl-smi">B</span>>> <span class="pl-s1">value</span>, <span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">Function1</span><<span class="pl-smi">A</span>, <span class="pl-smi">B</span>>> <span class="pl-s1">apply</span>) { <span class="pl-k">return</span> <span class="pl-en">flatMap</span>(<span class="pl-s1">value</span>, <span class="pl-s1">either</span> -> <span class="pl-s1">either</span>.<span class="pl-en">fold</span>(<span class="pl-s1">a</span> -> <span class="pl-en">map</span>(<span class="pl-s1">apply</span>, <span class="pl-s1">map</span> -> <span class="pl-s1">map</span>.<span class="pl-en">apply</span>(<span class="pl-s1">a</span>)), <span class="pl-smi">this</span>::<<span class="pl-smi">B</span>><span class="pl-s1">pure</span>)); } }</pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Semigroup</h3><a id="user-content-semigroup" class="anchor" aria-label="Permalink: Semigroup" href="#semigroup"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">It represents a binary operation over a type.</p> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="@FunctionalInterface public interface Semigroup<T> { T combine(T t1, T t2); }"><pre><span class="pl-c1">@</span><span class="pl-c1">FunctionalInterface</span> <span class="pl-k">public</span> <span class="pl-k">interface</span> <span class="pl-smi">Semigroup</span><<span class="pl-smi">T</span>> { <span class="pl-smi">T</span> <span class="pl-en">combine</span>(<span class="pl-smi">T</span> <span class="pl-s1">t1</span>, <span class="pl-smi">T</span> <span class="pl-s1">t2</span>); }</pre></div> <p dir="auto">There are instances for strings and integers.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Monoid</h3><a id="user-content-monoid" class="anchor" aria-label="Permalink: Monoid" href="#monoid"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Extends <code>Semigroup</code> adding a <code>zero</code> operation that represent an identity.</p> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="public interface Monoid<T> extends Semigroup<T> { T zero(); }"><pre><span class="pl-k">public</span> <span class="pl-k">interface</span> <span class="pl-smi">Monoid</span><<span class="pl-smi">T</span>> <span class="pl-k">extends</span> <span class="pl-smi">Semigroup</span><<span class="pl-smi">T</span>> { <span class="pl-smi">T</span> <span class="pl-en">zero</span>(); }</pre></div> <p dir="auto">There are instances for strings and integers.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">SemigroupK</h3><a id="user-content-semigroupk" class="anchor" aria-label="Permalink: SemigroupK" href="#semigroupk"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">It represents a <code>Semigroup</code> but defined for a kind, like a List, so it extends a regular <code>Semigroup</code>.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">MonoidK</h3><a id="user-content-monoidk" class="anchor" aria-label="Permalink: MonoidK" href="#monoidk"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The same like <code>SemigroupK</code> but for a <code>Monoid</code>.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Invariant</h3><a id="user-content-invariant" class="anchor" aria-label="Permalink: Invariant" href="#invariant"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="public interface Invariant<F> { <A, B> Kind<F, B> imap(Kind<F, A> value, Function1<A, B> map, Function1<B, A> comap); }"><pre><span class="pl-k">public</span> <span class="pl-k">interface</span> <span class="pl-smi">Invariant</span><<span class="pl-smi">F</span>> { <<span class="pl-smi">A</span>, <span class="pl-smi">B</span>> <span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">B</span>> <span class="pl-en">imap</span>(<span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">A</span>> <span class="pl-s1">value</span>, <span class="pl-smi">Function1</span><<span class="pl-smi">A</span>, <span class="pl-smi">B</span>> <span class="pl-s1">map</span>, <span class="pl-smi">Function1</span><<span class="pl-smi">B</span>, <span class="pl-smi">A</span>> <span class="pl-s1">comap</span>); }</pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Contravariant</h3><a id="user-content-contravariant" class="anchor" aria-label="Permalink: Contravariant" href="#contravariant"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="public interface Contravariant<F> extends Invariant<F> { <A, B> Kind<F, B> contramap(Kind<F, A> value, Function1<B, A> map); }"><pre><span class="pl-k">public</span> <span class="pl-k">interface</span> <span class="pl-smi">Contravariant</span><<span class="pl-smi">F</span>> <span class="pl-k">extends</span> <span class="pl-smi">Invariant</span><<span class="pl-smi">F</span>> { <<span class="pl-smi">A</span>, <span class="pl-smi">B</span>> <span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">B</span>> <span class="pl-en">contramap</span>(<span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">A</span>> <span class="pl-s1">value</span>, <span class="pl-smi">Function1</span><<span class="pl-smi">B</span>, <span class="pl-smi">A</span>> <span class="pl-s1">map</span>); }</pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Applicative Error</h3><a id="user-content-applicative-error" class="anchor" aria-label="Permalink: Applicative Error" href="#applicative-error"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="public interface ApplicativeError<F, E> extends Applicative<F> { <A> Kind<F, A> raiseError(E error); <A> Kind<F, A> handleErrorWith(Kind<F, A> value, Function1<E, ? extends Kind<F, A>> handler); }"><pre><span class="pl-k">public</span> <span class="pl-k">interface</span> <span class="pl-smi">ApplicativeError</span><<span class="pl-smi">F</span>, <span class="pl-smi">E</span>> <span class="pl-k">extends</span> <span class="pl-smi">Applicative</span><<span class="pl-smi">F</span>> { <<span class="pl-smi">A</span>> <span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">A</span>> <span class="pl-en">raiseError</span>(<span class="pl-smi">E</span> <span class="pl-s1">error</span>); <<span class="pl-smi">A</span>> <span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">A</span>> <span class="pl-en">handleErrorWith</span>(<span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">A</span>> <span class="pl-s1">value</span>, <span class="pl-smi">Function1</span><<span class="pl-smi">E</span>, ? <span class="pl-k">extends</span> <span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">A</span>>> <span class="pl-s1">handler</span>); }</pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Monad Error</h3><a id="user-content-monad-error" class="anchor" aria-label="Permalink: Monad Error" href="#monad-error"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="public interface MonadError<F, E> extends ApplicativeError<F, E>, Monad<F> { default <A> Kind<F, A> ensure(Kind<F, A> value, Producer<E> error, Matcher1<A> matcher) { return flatMap(value, a -> matcher.match(a) ? pure(a) : raiseError(error.get())); } }"><pre><span class="pl-k">public</span> <span class="pl-k">interface</span> <span class="pl-smi">MonadError</span><<span class="pl-smi">F</span>, <span class="pl-smi">E</span>> <span class="pl-k">extends</span> <span class="pl-smi">ApplicativeError</span><<span class="pl-smi">F</span>, <span class="pl-smi">E</span>>, <span class="pl-smi">Monad</span><<span class="pl-smi">F</span>> { <span class="pl-k">default</span> <<span class="pl-smi">A</span>> <span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">A</span>> <span class="pl-en">ensure</span>(<span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">A</span>> <span class="pl-s1">value</span>, <span class="pl-smi">Producer</span><<span class="pl-smi">E</span>> <span class="pl-s1">error</span>, <span class="pl-smi">Matcher1</span><<span class="pl-smi">A</span>> <span class="pl-s1">matcher</span>) { <span class="pl-k">return</span> <span class="pl-en">flatMap</span>(<span class="pl-s1">value</span>, <span class="pl-s1">a</span> -> <span class="pl-s1">matcher</span>.<span class="pl-en">match</span>(<span class="pl-s1">a</span>) ? <span class="pl-en">pure</span>(<span class="pl-s1">a</span>) : <span class="pl-en">raiseError</span>(<span class="pl-s1">error</span>.<span class="pl-en">get</span>())); } }</pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Monad Throw</h3><a id="user-content-monad-throw" class="anchor" aria-label="Permalink: Monad Throw" href="#monad-throw"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="public interface MonadThrow<F> extends MonadError<F, Throwable> { }"><pre><span class="pl-k">public</span> <span class="pl-k">interface</span> <span class="pl-smi">MonadThrow</span><<span class="pl-smi">F</span>> <span class="pl-k">extends</span> <span class="pl-smi">MonadError</span><<span class="pl-smi">F</span>, <span class="pl-smi">Throwable</span>> { }</pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">MonadReader</h3><a id="user-content-monadreader" class="anchor" aria-label="Permalink: MonadReader" href="#monadreader"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="public interface MonadReader<F, R> extends Monad<F> { Kind<F, R> ask(); default <A> Kind<F, A> reader(Function1<R, A> mapper) { return map(ask(), mapper); } }"><pre><span class="pl-k">public</span> <span class="pl-k">interface</span> <span class="pl-smi">MonadReader</span><<span class="pl-smi">F</span>, <span class="pl-smi">R</span>> <span class="pl-k">extends</span> <span class="pl-smi">Monad</span><<span class="pl-smi">F</span>> { <span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">R</span>> <span class="pl-en">ask</span>(); <span class="pl-k">default</span> <<span class="pl-smi">A</span>> <span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">A</span>> <span class="pl-en">reader</span>(<span class="pl-smi">Function1</span><<span class="pl-smi">R</span>, <span class="pl-smi">A</span>> <span class="pl-s1">mapper</span>) { <span class="pl-k">return</span> <span class="pl-en">map</span>(<span class="pl-en">ask</span>(), <span class="pl-s1">mapper</span>); } }</pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">MonadState</h3><a id="user-content-monadstate" class="anchor" aria-label="Permalink: MonadState" href="#monadstate"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="public interface MonadState<F, S> extends Monad<F> { Kind<F, S> get(); Kind<F, Unit> set(S state); default Kind<F, Unit> modify(Operator1<S> mapper) { return flatMap(get(), s -> set(mapper.apply(s))); } default <A> Kind<F, A> inspect(Function1<S, A> mapper) { return map(get(), mapper); } default <A> Kind<F, A> state(Function1<S, Tuple2<S, A>> mapper) { return flatMap(get(), s -> mapper.apply(s).applyTo((s1, a) -> map(set(s1), x -> a))); } }"><pre><span class="pl-k">public</span> <span class="pl-k">interface</span> <span class="pl-smi">MonadState</span><<span class="pl-smi">F</span>, <span class="pl-smi">S</span>> <span class="pl-k">extends</span> <span class="pl-smi">Monad</span><<span class="pl-smi">F</span>> { <span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">S</span>> <span class="pl-en">get</span>(); <span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">Unit</span>> <span class="pl-en">set</span>(<span class="pl-smi">S</span> <span class="pl-s1">state</span>); <span class="pl-k">default</span> <span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">Unit</span>> <span class="pl-en">modify</span>(<span class="pl-smi">Operator1</span><<span class="pl-smi">S</span>> <span class="pl-s1">mapper</span>) { <span class="pl-k">return</span> <span class="pl-en">flatMap</span>(<span class="pl-en">get</span>(), <span class="pl-s1">s</span> -> <span class="pl-en">set</span>(<span class="pl-s1">mapper</span>.<span class="pl-en">apply</span>(<span class="pl-s1">s</span>))); } <span class="pl-k">default</span> <<span class="pl-smi">A</span>> <span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">A</span>> <span class="pl-en">inspect</span>(<span class="pl-smi">Function1</span><<span class="pl-smi">S</span>, <span class="pl-smi">A</span>> <span class="pl-s1">mapper</span>) { <span class="pl-k">return</span> <span class="pl-en">map</span>(<span class="pl-en">get</span>(), <span class="pl-s1">mapper</span>); } <span class="pl-k">default</span> <<span class="pl-smi">A</span>> <span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">A</span>> <span class="pl-en">state</span>(<span class="pl-smi">Function1</span><<span class="pl-smi">S</span>, <span class="pl-smi">Tuple2</span><<span class="pl-smi">S</span>, <span class="pl-smi">A</span>>> <span class="pl-s1">mapper</span>) { <span class="pl-k">return</span> <span class="pl-en">flatMap</span>(<span class="pl-en">get</span>(), <span class="pl-s1">s</span> -> <span class="pl-s1">mapper</span>.<span class="pl-en">apply</span>(<span class="pl-s1">s</span>).<span class="pl-en">applyTo</span>((<span class="pl-s1">s1</span>, <span class="pl-s1">a</span>) -> <span class="pl-en">map</span>(<span class="pl-en">set</span>(<span class="pl-s1">s1</span>), <span class="pl-s1">x</span> -> <span class="pl-s1">a</span>))); } }</pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">MonadWriter</h3><a id="user-content-monadwriter" class="anchor" aria-label="Permalink: MonadWriter" href="#monadwriter"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="public interface MonadWriter<F, W> extends Monad<F> { <A> Kind<F, A> writer(Tuple2<W, A> value); <A> Kind<F, Tuple2<W, A>> listen(Kind<F, A> value); <A> Kind<F, A> pass(Kind<F, Tuple2<Operator1<W>, A>> value); default Kind<F, Unit> tell(W writer) { return writer(Tuple.of(writer, unit())); } }"><pre><span class="pl-k">public</span> <span class="pl-k">interface</span> <span class="pl-smi">MonadWriter</span><<span class="pl-smi">F</span>, <span class="pl-smi">W</span>> <span class="pl-k">extends</span> <span class="pl-smi">Monad</span><<span class="pl-smi">F</span>> { <<span class="pl-smi">A</span>> <span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">A</span>> <span class="pl-en">writer</span>(<span class="pl-smi">Tuple2</span><<span class="pl-smi">W</span>, <span class="pl-smi">A</span>> <span class="pl-s1">value</span>); <<span class="pl-smi">A</span>> <span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">Tuple2</span><<span class="pl-smi">W</span>, <span class="pl-smi">A</span>>> <span class="pl-en">listen</span>(<span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">A</span>> <span class="pl-s1">value</span>); <<span class="pl-smi">A</span>> <span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">A</span>> <span class="pl-en">pass</span>(<span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">Tuple2</span><<span class="pl-smi">Operator1</span><<span class="pl-smi">W</span>>, <span class="pl-smi">A</span>>> <span class="pl-s1">value</span>); <span class="pl-k">default</span> <span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">Unit</span>> <span class="pl-en">tell</span>(<span class="pl-smi">W</span> <span class="pl-s1">writer</span>) { <span class="pl-k">return</span> <span class="pl-en">writer</span>(<span class="pl-smi">Tuple</span>.<span class="pl-en">of</span>(<span class="pl-s1">writer</span>, <span class="pl-en">unit</span>())); } }</pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Comonad</h3><a id="user-content-comonad" class="anchor" aria-label="Permalink: Comonad" href="#comonad"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="public interface Comonad<F> extends Functor<F> { <A, B> Kind<F, B> coflatMap(Kind<F, A> value, Function1<Kind<F, A>, B> map); <A> A extract(Kind<F, A> value); default <A> Kind<F, Kind<F, A>> coflatten(Kind<F, A> value) { return coflatMap(value, identity()); } }"><pre><span class="pl-k">public</span> <span class="pl-k">interface</span> <span class="pl-smi">Comonad</span><<span class="pl-smi">F</span>> <span class="pl-k">extends</span> <span class="pl-smi">Functor</span><<span class="pl-smi">F</span>> { <<span class="pl-smi">A</span>, <span class="pl-smi">B</span>> <span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">B</span>> <span class="pl-en">coflatMap</span>(<span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">A</span>> <span class="pl-s1">value</span>, <span class="pl-smi">Function1</span><<span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">A</span>>, <span class="pl-smi">B</span>> <span class="pl-s1">map</span>); <<span class="pl-smi">A</span>> <span class="pl-smi">A</span> <span class="pl-en">extract</span>(<span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">A</span>> <span class="pl-s1">value</span>); <span class="pl-k">default</span> <<span class="pl-smi">A</span>> <span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">A</span>>> <span class="pl-en">coflatten</span>(<span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">A</span>> <span class="pl-s1">value</span>) { <span class="pl-k">return</span> <span class="pl-en">coflatMap</span>(<span class="pl-s1">value</span>, <span class="pl-en">identity</span>()); } }</pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Foldable</h3><a id="user-content-foldable" class="anchor" aria-label="Permalink: Foldable" href="#foldable"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="public interface Foldable<F> { <A, B> B foldLeft(Kind<F, A> value, B initial, Function2<B, A, B> mapper); <A, B> Eval<B> foldRight(Kind<F, A> value, Eval<B> initial, Function2<A, Eval<B>, Eval<B>> mapper); }"><pre><span class="pl-k">public</span> <span class="pl-k">interface</span> <span class="pl-smi">Foldable</span><<span class="pl-smi">F</span>> { <<span class="pl-smi">A</span>, <span class="pl-smi">B</span>> <span class="pl-smi">B</span> <span class="pl-en">foldLeft</span>(<span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">A</span>> <span class="pl-s1">value</span>, <span class="pl-smi">B</span> <span class="pl-s1">initial</span>, <span class="pl-smi">Function2</span><<span class="pl-smi">B</span>, <span class="pl-smi">A</span>, <span class="pl-smi">B</span>> <span class="pl-s1">mapper</span>); <<span class="pl-smi">A</span>, <span class="pl-smi">B</span>> <span class="pl-smi">Eval</span><<span class="pl-smi">B</span>> <span class="pl-en">foldRight</span>(<span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">A</span>> <span class="pl-s1">value</span>, <span class="pl-smi">Eval</span><<span class="pl-smi">B</span>> <span class="pl-s1">initial</span>, <span class="pl-smi">Function2</span><<span class="pl-smi">A</span>, <span class="pl-smi">Eval</span><<span class="pl-smi">B</span>>, <span class="pl-smi">Eval</span><<span class="pl-smi">B</span>>> <span class="pl-s1">mapper</span>); }</pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Traverse</h3><a id="user-content-traverse" class="anchor" aria-label="Permalink: Traverse" href="#traverse"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="public interface Traverse<F> extends Functor<F>, Foldable<F> { <G, T, R> Kind<G, Kind<F, R>> traverse(Applicative<G> applicative, Kind<F, T> value, Function1<T, ? extends Kind<G, R>> mapper); }"><pre><span class="pl-k">public</span> <span class="pl-k">interface</span> <span class="pl-smi">Traverse</span><<span class="pl-smi">F</span>> <span class="pl-k">extends</span> <span class="pl-smi">Functor</span><<span class="pl-smi">F</span>>, <span class="pl-smi">Foldable</span><<span class="pl-smi">F</span>> { <<span class="pl-smi">G</span>, <span class="pl-smi">T</span>, <span class="pl-smi">R</span>> <span class="pl-smi">Kind</span><<span class="pl-smi">G</span>, <span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">R</span>>> <span class="pl-en">traverse</span>(<span class="pl-smi">Applicative</span><<span class="pl-smi">G</span>> <span class="pl-s1">applicative</span>, <span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">T</span>> <span class="pl-s1">value</span>, <span class="pl-smi">Function1</span><<span class="pl-smi">T</span>, ? <span class="pl-k">extends</span> <span class="pl-smi">Kind</span><<span class="pl-smi">G</span>, <span class="pl-smi">R</span>>> <span class="pl-s1">mapper</span>); }</pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Semigroupal</h3><a id="user-content-semigroupal" class="anchor" aria-label="Permalink: Semigroupal" href="#semigroupal"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="public interface Semigroupal<F> { <A, B> Kind<F, Tuple2<A, B>> product(Kind<F, A> fa, Kind<F, B> fb); }"><pre><span class="pl-k">public</span> <span class="pl-k">interface</span> <span class="pl-smi">Semigroupal</span><<span class="pl-smi">F</span>> { <<span class="pl-smi">A</span>, <span class="pl-smi">B</span>> <span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">Tuple2</span><<span class="pl-smi">A</span>, <span class="pl-smi">B</span>>> <span class="pl-en">product</span>(<span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">A</span>> <span class="pl-s1">fa</span>, <span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">B</span>> <span class="pl-s1">fb</span>); }</pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Defer</h3><a id="user-content-defer" class="anchor" aria-label="Permalink: Defer" href="#defer"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="public interface Defer<F> { <A> Kind<F, A> defer(Producer<Kind<F, A>> defer); }"><pre><span class="pl-k">public</span> <span class="pl-k">interface</span> <span class="pl-smi">Defer</span><<span class="pl-smi">F</span>> { <<span class="pl-smi">A</span>> <span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">A</span>> <span class="pl-en">defer</span>(<span class="pl-smi">Producer</span><<span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">A</span>>> <span class="pl-s1">defer</span>); }</pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Bracket</h3><a id="user-content-bracket" class="anchor" aria-label="Permalink: Bracket" href="#bracket"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="public interface Bracket<F, E> extends MonadError<F, E> { <A, B> Kind<F, B> bracket(Kind<F, A> acquire, Function1<A, ? extends Kind<F, B>> use, Consumer1<A> release); }"><pre><span class="pl-k">public</span> <span class="pl-k">interface</span> <span class="pl-smi">Bracket</span><<span class="pl-smi">F</span>, <span class="pl-smi">E</span>> <span class="pl-k">extends</span> <span class="pl-smi">MonadError</span><<span class="pl-smi">F</span>, <span class="pl-smi">E</span>> { <<span class="pl-smi">A</span>, <span class="pl-smi">B</span>> <span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">B</span>> <span class="pl-en">bracket</span>(<span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">A</span>> <span class="pl-s1">acquire</span>, <span class="pl-smi">Function1</span><<span class="pl-smi">A</span>, ? <span class="pl-k">extends</span> <span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">B</span>>> <span class="pl-s1">use</span>, <span class="pl-smi">Consumer1</span><<span class="pl-smi">A</span>> <span class="pl-s1">release</span>); }</pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">MonadDefer</h3><a id="user-content-monaddefer" class="anchor" aria-label="Permalink: MonadDefer" href="#monaddefer"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="public interface MonadDefer<F> extends MonadThrow<F>, Bracket<F, Throwable>, Defer<F>, Timer<F> { default <A> Kind<F, A> later(Producer<A> later) { return defer(() -> Try.of(later::get).fold(this::raiseError, this::pure)); } }"><pre><span class="pl-k">public</span> <span class="pl-k">interface</span> <span class="pl-smi">MonadDefer</span><<span class="pl-smi">F</span>> <span class="pl-k">extends</span> <span class="pl-smi">MonadThrow</span><<span class="pl-smi">F</span>>, <span class="pl-smi">Bracket</span><<span class="pl-smi">F</span>, <span class="pl-smi">Throwable</span>>, <span class="pl-smi">Defer</span><<span class="pl-smi">F</span>>, <span class="pl-smi">Timer</span><<span class="pl-smi">F</span>> { <span class="pl-k">default</span> <<span class="pl-smi">A</span>> <span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">A</span>> <span class="pl-en">later</span>(<span class="pl-smi">Producer</span><<span class="pl-smi">A</span>> <span class="pl-s1">later</span>) { <span class="pl-k">return</span> <span class="pl-en">defer</span>(() -> <span class="pl-smi">Try</span>.<span class="pl-en">of</span>(<span class="pl-s1">later</span>::<span class="pl-s1">get</span>).<span class="pl-en">fold</span>(<span class="pl-smi">this</span>::<span class="pl-s1">raiseError</span>, <span class="pl-smi">this</span>::<span class="pl-s1">pure</span>)); } }</pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Async</h3><a id="user-content-async" class="anchor" aria-label="Permalink: Async" href="#async"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="public interface Async<F> extends MonadDefer<F> { <A> Kind<F, A> async(Consumer1<Consumer1<Try<A>>> consumer); }"><pre><span class="pl-k">public</span> <span class="pl-k">interface</span> <span class="pl-smi">Async</span><<span class="pl-smi">F</span>> <span class="pl-k">extends</span> <span class="pl-smi">MonadDefer</span><<span class="pl-smi">F</span>> { <<span class="pl-smi">A</span>> <span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">A</span>> <span class="pl-en">async</span>(<span class="pl-smi">Consumer1</span><<span class="pl-smi">Consumer1</span><<span class="pl-smi">Try</span><<span class="pl-smi">A</span>>>> <span class="pl-s1">consumer</span>); }</pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Timer</h3><a id="user-content-timer" class="anchor" aria-label="Permalink: Timer" href="#timer"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="public interface Timer<F> { Kind<F, Unit> sleep(Duration duration); }"><pre><span class="pl-k">public</span> <span class="pl-k">interface</span> <span class="pl-smi">Timer</span><<span class="pl-smi">F</span>> { <span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">Unit</span>> <span class="pl-en">sleep</span>(<span class="pl-smi">Duration</span> <span class="pl-s1">duration</span>); }</pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">FunctionK</h3><a id="user-content-functionk" class="anchor" aria-label="Permalink: FunctionK" href="#functionk"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">It represents a natural transformation between two different kinds.</p> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="public interface FunctionK<F, G> { <T> Kind<G, T> apply(Kind<F, T> from); }"><pre><span class="pl-k">public</span> <span class="pl-k">interface</span> <span class="pl-smi">FunctionK</span><<span class="pl-smi">F</span>, <span class="pl-smi">G</span>> { <<span class="pl-smi">T</span>> <span class="pl-smi">Kind</span><<span class="pl-smi">G</span>, <span class="pl-smi">T</span>> <span class="pl-en">apply</span>(<span class="pl-smi">Kind</span><<span class="pl-smi">F</span>, <span class="pl-smi">T</span>> <span class="pl-s1">from</span>); }</pre></div> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Optics</h2><a id="user-content-optics" class="anchor" aria-label="Permalink: Optics" href="#optics"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content=" __Iso__ / \ Lens Prism \ / Optional"><pre class="notranslate"><code> __Iso__ / \ Lens Prism \ / Optional </code></pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Iso</h3><a id="user-content-iso" class="anchor" aria-label="Permalink: Iso" href="#iso"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">An <code>Iso</code> is an optic which converts elements of some type into elements of other type without loss. In other words, it's <strong>isomorphic</strong>.</p> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="Point point = new Point(1, 2); Iso<Point, Tuple2<Integer, Integer>> pointToTuple = Iso.of(p -> Tuple.of(p.x, p.y), t -> new Point(t.get1(), t.get2())); assertEquals(point, pointToTuple.set(pointToTuple.get(point)));"><pre><span class="pl-smi">Point</span> <span class="pl-s1">point</span> = <span class="pl-k">new</span> <span class="pl-smi">Point</span>(<span class="pl-c1">1</span>, <span class="pl-c1">2</span>); <span class="pl-smi">Iso</span><<span class="pl-smi">Point</span>, <span class="pl-smi">Tuple2</span><<span class="pl-smi">Integer</span>, <span class="pl-smi">Integer</span>>> <span class="pl-s1">pointToTuple</span> = <span class="pl-smi">Iso</span>.<span class="pl-en">of</span>(<span class="pl-s1">p</span> -> <span class="pl-smi">Tuple</span>.<span class="pl-en">of</span>(<span class="pl-s1">p</span>.<span class="pl-s1">x</span>, <span class="pl-s1">p</span>.<span class="pl-s1">y</span>), <span class="pl-s1">t</span> -> <span class="pl-k">new</span> <span class="pl-smi">Point</span>(<span class="pl-s1">t</span>.<span class="pl-en">get1</span>(), <span class="pl-s1">t</span>.<span class="pl-en">get2</span>())); <span class="pl-en">assertEquals</span>(<span class="pl-s1">point</span>, <span class="pl-s1">pointToTuple</span>.<span class="pl-en">set</span>(<span class="pl-s1">pointToTuple</span>.<span class="pl-en">get</span>(<span class="pl-s1">point</span>)));</pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Lens</h3><a id="user-content-lens" class="anchor" aria-label="Permalink: Lens" href="#lens"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">A <code>Lens</code> is an optic used to zoom inside a structure. In other words, it's an abstraction of a setter and a getter but with immutable objects.</p> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="Lens<Employee, String> nameLens = Lens.of(Employee::getName, Employee::withName); Employee pepe = new Employee("pepe"); assertEquals("pepe", nameLens.get(pepe)); assertEquals("paco", nameLens.get(nameLens.set(pepe, "paco")));"><pre><span class="pl-smi">Lens</span><<span class="pl-smi">Employee</span>, <span class="pl-smi">String</span>> <span class="pl-s1">nameLens</span> = <span class="pl-smi">Lens</span>.<span class="pl-en">of</span>(<span class="pl-smi">Employee</span>::<span class="pl-s1">getName</span>, <span class="pl-smi">Employee</span>::<span class="pl-s1">withName</span>); <span class="pl-smi">Employee</span> <span class="pl-s1">pepe</span> = <span class="pl-k">new</span> <span class="pl-smi">Employee</span>(<span class="pl-s">"pepe"</span>); <span class="pl-en">assertEquals</span>(<span class="pl-s">"pepe"</span>, <span class="pl-s1">nameLens</span>.<span class="pl-en">get</span>(<span class="pl-s1">pepe</span>)); <span class="pl-en">assertEquals</span>(<span class="pl-s">"paco"</span>, <span class="pl-s1">nameLens</span>.<span class="pl-en">get</span>(<span class="pl-s1">nameLens</span>.<span class="pl-en">set</span>(<span class="pl-s1">pepe</span>, <span class="pl-s">"paco"</span>)));</pre></div> <p dir="auto">We can compose Lenses to get deeper inside. For example, if we add an attribute of type <code>Address</code> into <code>Employee</code>. We can create a lens to access the city name of the address of the employee.</p> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="Lens<Employee, Address> addressLens = Lens.of(Employee::getAddress, Employee::withAddress); Lens<Address, String> cityLens = Lens.of(Address::getCity, Address::withCity); Lens<Employee, String> cityAddressLens = addressLens.compose(cityLens); Employee pepe = new Employee("pepe", new Address("Madrid")); assertEquals("Madrid", cityAddressLens.get(pepe));"><pre><span class="pl-smi">Lens</span><<span class="pl-smi">Employee</span>, <span class="pl-smi">Address</span>> <span class="pl-s1">addressLens</span> = <span class="pl-smi">Lens</span>.<span class="pl-en">of</span>(<span class="pl-smi">Employee</span>::<span class="pl-s1">getAddress</span>, <span class="pl-smi">Employee</span>::<span class="pl-s1">withAddress</span>); <span class="pl-smi">Lens</span><<span class="pl-smi">Address</span>, <span class="pl-smi">String</span>> <span class="pl-s1">cityLens</span> = <span class="pl-smi">Lens</span>.<span class="pl-en">of</span>(<span class="pl-smi">Address</span>::<span class="pl-s1">getCity</span>, <span class="pl-smi">Address</span>::<span class="pl-s1">withCity</span>); <span class="pl-smi">Lens</span><<span class="pl-smi">Employee</span>, <span class="pl-smi">String</span>> <span class="pl-s1">cityAddressLens</span> = <span class="pl-s1">addressLens</span>.<span class="pl-en">compose</span>(<span class="pl-s1">cityLens</span>); <span class="pl-smi">Employee</span> <span class="pl-s1">pepe</span> = <span class="pl-k">new</span> <span class="pl-smi">Employee</span>(<span class="pl-s">"pepe"</span>, <span class="pl-k">new</span> <span class="pl-smi">Address</span>(<span class="pl-s">"Madrid"</span>)); <span class="pl-en">assertEquals</span>(<span class="pl-s">"Madrid"</span>, <span class="pl-s1">cityAddressLens</span>.<span class="pl-en">get</span>(<span class="pl-s1">pepe</span>));</pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Prism</h3><a id="user-content-prism" class="anchor" aria-label="Permalink: Prism" href="#prism"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">A <code>Prism</code> is a lossless invertible optic that can see into a structure and optionally find a value.</p> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="Function1<String, Option<Integer>> parseInt = ...; // is a method that only returns a value when the string can be parsed Prism<String, Integer> stringToInteger = Prism.of(parseInt, String::valueOf); assertEquals(Option.some(5), stringToInteger.getOption("5")); assertEquals(Option.none(), stringToInteger.getOption("a")); assertEquals("5", stringToInteger.reverseGet(5));"><pre><span class="pl-smi">Function1</span><<span class="pl-smi">String</span>, <span class="pl-smi">Option</span><<span class="pl-smi">Integer</span>>> <span class="pl-s1">parseInt</span> = ...; <span class="pl-c">// is a method that only returns a value when the string can be parsed</span> <span class="pl-smi">Prism</span><<span class="pl-smi">String</span>, <span class="pl-smi">Integer</span>> <span class="pl-s1">stringToInteger</span> = <span class="pl-smi">Prism</span>.<span class="pl-en">of</span>(<span class="pl-s1">parseInt</span>, <span class="pl-smi">String</span>::<span class="pl-s1">valueOf</span>); <span class="pl-en">assertEquals</span>(<span class="pl-smi">Option</span>.<span class="pl-en">some</span>(<span class="pl-c1">5</span>), <span class="pl-s1">stringToInteger</span>.<span class="pl-en">getOption</span>(<span class="pl-s">"5"</span>)); <span class="pl-en">assertEquals</span>(<span class="pl-smi">Option</span>.<span class="pl-en">none</span>(), <span class="pl-s1">stringToInteger</span>.<span class="pl-en">getOption</span>(<span class="pl-s">"a"</span>)); <span class="pl-en">assertEquals</span>(<span class="pl-s">"5"</span>, <span class="pl-s1">stringToInteger</span>.<span class="pl-en">reverseGet</span>(<span class="pl-c1">5</span>));</pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Optional</h3><a id="user-content-optional" class="anchor" aria-label="Permalink: Optional" href="#optional"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">An <code>Optional</code> is an optic that allows to see into a structure and getting, setting like a <code>Lens</code> an optional find a value like a <code>Prism</code>.</p> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="Optional<Employee, Address> addressOptional = Optional.of( Employee::withAddress, employee -> Option.of(employee::getAddress) ); Address madrid = new Address("Madrid"); Employee pepe = new Employee("pepe", null); assertEquals(Option.none(), addressOptional.getOption(pepe)); assertEquals(Option.some(madrid), addressOptional.getOption(addressOptional.set(pepe, madrid)));"><pre><span class="pl-smi">Optional</span><<span class="pl-smi">Employee</span>, <span class="pl-smi">Address</span>> <span class="pl-s1">addressOptional</span> = <span class="pl-smi">Optional</span>.<span class="pl-en">of</span>( <span class="pl-smi">Employee</span>::<span class="pl-s1">withAddress</span>, <span class="pl-s1">employee</span> -> <span class="pl-smi">Option</span>.<span class="pl-en">of</span>(<span class="pl-s1">employee</span>::<span class="pl-s1">getAddress</span>) ); <span class="pl-smi">Address</span> <span class="pl-s1">madrid</span> = <span class="pl-k">new</span> <span class="pl-smi">Address</span>(<span class="pl-s">"Madrid"</span>); <span class="pl-smi">Employee</span> <span class="pl-s1">pepe</span> = <span class="pl-k">new</span> <span class="pl-smi">Employee</span>(<span class="pl-s">"pepe"</span>, <span class="pl-c1">null</span>); <span class="pl-en">assertEquals</span>(<span class="pl-smi">Option</span>.<span class="pl-en">none</span>(), <span class="pl-s1">addressOptional</span>.<span class="pl-en">getOption</span>(<span class="pl-s1">pepe</span>)); <span class="pl-en">assertEquals</span>(<span class="pl-smi">Option</span>.<span class="pl-en">some</span>(<span class="pl-s1">madrid</span>), <span class="pl-s1">addressOptional</span>.<span class="pl-en">getOption</span>(<span class="pl-s1">addressOptional</span>.<span class="pl-en">set</span>(<span class="pl-s1">pepe</span>, <span class="pl-s1">madrid</span>)));</pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Composition</h3><a id="user-content-composition" class="anchor" aria-label="Permalink: Composition" href="#composition"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <markdown-accessiblity-table><table> <thead> <tr> <th></th> <th>Optional</th> <th>Prism</th> <th>Lens</th> <th>Iso</th> </tr> </thead> <tbody> <tr> <td>Optional</td> <td>Optional</td> <td>Optional</td> <td>Optional</td> <td>Optional</td> </tr> <tr> <td>Prism</td> <td>Optional</td> <td>Prism</td> <td>Optional</td> <td>Prism</td> </tr> <tr> <td>Lens</td> <td>Optional</td> <td>Optional</td> <td>Lens</td> <td>Lens</td> </tr> <tr> <td>Iso</td> <td>Optional</td> <td>Prism</td> <td>Lens</td> <td>Iso</td> </tr> </tbody> </table></markdown-accessiblity-table> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Equal</h2><a id="user-content-equal" class="anchor" aria-label="Permalink: Equal" href="#equal"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">This class helps to create readable <code>equals</code> methods. An example:</p> <div class="highlight highlight-source-java notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="@Override public boolean equals(Object obj) { return Equal.<Data>of() .comparing(Data::getId) .comparing(Data::getValue) .applyTo(this, obj); }"><pre><span class="pl-c1">@</span><span class="pl-c1">Override</span> <span class="pl-k">public</span> <span class="pl-smi">boolean</span> <span class="pl-en">equals</span>(<span class="pl-smi">Object</span> <span class="pl-s1">obj</span>) { <span class="pl-k">return</span> <span class="pl-smi">Equal</span>.<<span class="pl-smi">Data</span>><span class="pl-en">of</span>() .<span class="pl-en">comparing</span>(<span class="pl-smi">Data</span>::<span class="pl-s1">getId</span>) .<span class="pl-en">comparing</span>(<span class="pl-smi">Data</span>::<span class="pl-s1">getValue</span>) .<span class="pl-en">applyTo</span>(<span class="pl-smi">this</span>, <span class="pl-s1">obj</span>); }</pre></div> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Stargazers over time</h2><a id="user-content-stargazers-over-time" class="anchor" aria-label="Permalink: Stargazers over time" href="#stargazers-over-time"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto"><a href="https://starchart.cc/tonivade/purefun" rel="nofollow"><img src="https://camo.githubusercontent.com/1bc53b2190634636a678bcca9a87ffd840135f393f49c749a3842879da7d2aa0/68747470733a2f2f7374617263686172742e63632f746f6e69766164652f7075726566756e2e737667" alt="Stargazers over time" data-canonical-src="https://starchart.cc/tonivade/purefun.svg" style="max-width: 100%;"></a></p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">License</h2><a id="user-content-license" class="anchor" aria-label="Permalink: License" href="#license"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">purefun is released under MIT license</p> </article></div></div></div></div></div> <!-- --> <!-- --> <script type="application/json" id="__PRIMER_DATA_:R0:__">{"resolvedServerColorMode":"day"}</script></div> </react-partial> <input type="hidden" data-csrf="true" value="EWjOKj/sN+UOALnIG9dxNs16OfTxhXd+2stxnMRxsc/DPxFCHM/mljcWzaL1EqnCwS37V4prN6pOn04oXESFRA==" /> </div> <div data-view-component="true" class="Layout-sidebar"> <div class="BorderGrid about-margin" data-pjax> <div class="BorderGrid-row"> <div class="BorderGrid-cell"> <div class="hide-sm hide-md"> <h2 class="mb-3 h4">About</h2> <p class="f4 my-3"> Functional Programming library for Java </p> <h3 class="sr-only">Topics</h3> <div class="my-3"> <div class="f6"> <a href="/topics/java" title="Topic: java" 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0-.136c-.412-.621-1.242-1.75-2.366-2.717C10.824 4.242 9.473 3.5 8 3.5c-1.473 0-2.825.742-3.955 1.715-1.124.967-1.954 2.096-2.366 2.717ZM8 10a2 2 0 1 1-.001-3.999A2 2 0 0 1 8 10Z"></path> </svg> <strong>7</strong> watching</a> </div> <h3 class="sr-only">Forks</h3> <div class="mt-2"> <a href="/tonivade/purefun/forks" data-view-component="true" class="Link Link--muted"><svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-repo-forked mr-2"> <path d="M5 5.372v.878c0 .414.336.75.75.75h4.5a.75.75 0 0 0 .75-.75v-.878a2.25 2.25 0 1 1 1.5 0v.878a2.25 2.25 0 0 1-2.25 2.25h-1.5v2.128a2.251 2.251 0 1 1-1.5 0V8.5h-1.5A2.25 2.25 0 0 1 3.5 6.25v-.878a2.25 2.25 0 1 1 1.5 0ZM5 3.25a.75.75 0 1 0-1.5 0 .75.75 0 0 0 1.5 0Zm6.75.75a.75.75 0 1 0 0-1.5.75.75 0 0 0 0 1.5Zm-3 8.75a.75.75 0 1 0-1.5 0 .75.75 0 0 0 1.5 0Z"></path> </svg> <strong>4</strong> forks</a> </div> <div class="mt-2"> <a class="Link--muted" 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1.75 0 0 1-2.474 0l-6.25-6.25A1.752 1.752 0 0 1 1 7.775Zm1.5 0c0 .066.026.13.073.177l6.25 6.25a.25.25 0 0 0 .354 0l5.025-5.025a.25.25 0 0 0 0-.354l-6.25-6.25a.25.25 0 0 0-.177-.073H2.75a.25.25 0 0 0-.25.25ZM6 5a1 1 0 1 1 0 2 1 1 0 0 1 0-2Z"></path> </svg> <div class="ml-2 min-width-0"> <div class="d-flex"> <span class="css-truncate css-truncate-target text-bold mr-2" style="max-width: none;">v5.0 new release</span> <span title="Label: Latest" data-view-component="true" class="Label Label--success flex-shrink-0"> Latest </span> </div> <div class="text-small color-fg-muted"><relative-time datetime="2024-06-15T08:10:41Z" class="no-wrap">Jun 15, 2024</relative-time></div> </div> </a> <div data-view-component="true" class="mt-3"> <a text="small" data-pjax="#repo-content-pjax-container" data-turbo-frame="repo-content-turbo-frame" href="/tonivade/purefun/releases" data-view-component="true" class="Link">+ 1 release</a></div> </div> </div> <div class="BorderGrid-row"> <div 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