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3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">Learn</span><meta itemprop="position" content="1"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">Design choices</span><meta itemprop="position" content="2"></li></ul></nav><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>Design choices</h1></header><h2 class="anchor anchorWithStickyNavbar_LWe7" id="chaining-api">Chaining API<a href="#chaining-api" class="hash-link" aria-label="Direct link to Chaining API" title="Direct link to Chaining API"></a></h2><p>Most functional programming libraries in JavaScript provide a data-last API (<code>map(func)(value)</code>) along with a <code>pipe</code> function to chain operations.</p><p>While this approach works well in languages that include some kind of native pipe operator, we consider that it doesn't provide a good enough developer experience in your TypeScript code editor: it makes it tedious to inspect a value in a <code>pipe</code> chain and doesn't provide autocomplete natively.</p><p>For this reason, we decided to use good ol'chaining, reducing the number of imports, making your code more expressive, easier to read and inspect.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="eager-over-lazy">Eager over lazy<a href="#eager-over-lazy" class="hash-link" aria-label="Direct link to Eager over lazy" title="Direct link to Eager over lazy"></a></h2><p>More often than not, these functional programming libraries use lazy initialisation, meaning your code won't execute until you tell it to explicitely (e.g. with a <code>run</code> call at the end).</p><p>In the vast majority of cases we've seen, this is not something that's wanted. For the few cases where laziness is wanted, making a function that returns the data-structure or using a <code>Deferred</code> does the job pretty well.</p><div class="language-ts codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-ts codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token keyword" style="color:#00009f">const</span><span class="token plain"> eagerFuture </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> Future</span><span class="token punctuation" style="color:#393A34">.</span><span class="token function" style="color:#d73a49">make</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">resolve</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">=></span><span class="token plain"> </span><span class="token function" style="color:#d73a49">resolve</span><span class="token punctuation" style="color:#393A34">(</span><span class="token number" style="color:#36acaa">1</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#00009f">const</span><span class="token plain"> </span><span class="token function-variable function" style="color:#d73a49">lazyFuture</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">=></span><span class="token plain"> Future</span><span class="token punctuation" style="color:#393A34">.</span><span class="token function" style="color:#d73a49">make</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">resolve</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">=></span><span class="token plain"> </span><span class="token function" style="color:#d73a49">resolve</span><span class="token punctuation" style="color:#393A34">(</span><span class="token number" style="color:#36acaa">1</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#00009f">const</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">[</span><span class="token plain">deferred</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> resolve</span><span class="token punctuation" style="color:#393A34">]</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> Deferred</span><span class="token punctuation" style="color:#393A34">.</span><span class="token generic-function function" style="color:#d73a49">make</span><span class="token generic-function generic class-name operator" style="color:#393A34"><</span><span class="token generic-function generic class-name builtin">number</span><span class="token generic-function generic class-name operator" style="color:#393A34">></span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h2 class="anchor anchorWithStickyNavbar_LWe7" id="naming">Naming<a href="#naming" class="hash-link" aria-label="Direct link to Naming" title="Direct link to Naming"></a></h2><p>Rather than using naming from abstract theory, if a concept exists in JavaScript built-ins, Boxed will provide similar naming (e.g. we provide <code>Future.all</code> to mimic <code>Promise.all</code> rather than <code>Future.sequenceArray</code>).</p></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="theme-doc-footer-edit-meta-row row"><div class="col"><a href="https://github.com/swan-io/boxed/edit/main/docs/docs/design-choices.md" target="_blank" rel="noreferrer noopener" class="theme-edit-this-page"><svg fill="currentColor" height="20" width="20" viewBox="0 0 40 40" class="iconEdit_Z9Sw" aria-hidden="true"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 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