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href="/?sca_esv=2eee718c337252b9&output=search&sa=X&ved=0ahUKEwiY_PfOhdOLAxWncGwGHSvbMHYQPAgC"><img class="kgJEQe" src="/images/branding/searchlogo/1x/googlelogo_desk_heirloom_color_150x55dp.gif" alt="Google"/></a></div><div class="FbhRzb"><form action="/search"><input name="sca_esv" value="2eee718c337252b9" type="hidden"/><input name="oq" type="hidden"/><input name="aqs" type="hidden"/><table class="cvifge"><tr><td class="O4cRJf"><input class="MhzMZd" value="pure functions" name="q" type="text"/></td><td class="O1ePr"><input class="xB0fq" value="Search" type="submit"/></td></tr></table></form></div><div class="M7pB2"><table class="euZec"><tbody><tr><td class="EY24We"><span class="QIqI7">ALL</span></td><td><a class="CsQyDc" href="/search?q=pure+functions&sca_esv=2eee718c337252b9&tbm=isch&source=lnms&sa=X&ved=0ahUKEwiY_PfOhdOLAxWncGwGHSvbMHYQ_AUIBSgB">IMAGES</a></td><td><a class="CsQyDc" href="/search?q=pure+functions&sca_esv=2eee718c337252b9&udm=36&source=lnms&sa=X&ved=0ahUKEwiY_PfOhdOLAxWncGwGHSvbMHYQ_AUIBigC">BOOKS</a></td><td><a class="CsQyDc" href="/search?q=pure+functions&sca_esv=2eee718c337252b9&tbm=vid&source=lnms&sa=X&ved=0ahUKEwiY_PfOhdOLAxWncGwGHSvbMHYQ_AUIBygD">VIDEOS</a></td></tr></tbody></table></div></div><div><div> <div> <div class="ezO2md"><div><div class="FYYwXe"> <div> <span class="qXLe6d FrIlee"> <span class="fYyStc">A pure function is </span> <span class="dloBPe fYyStc">a function that depends only on its declared inputs and its internal algorithm to produce its output</span> <span class="fYyStc">. It does not read any other values from “the outside world” — the world outside of the function's scope — and it does not modify any values in the outside world.</span> </span> </div> </div><div><a class="fuLhoc ZWRArf" href="/url?q=https://docs.scala-lang.org/overviews/scala-book/pure-functions.html&sa=U&ved=2ahUKEwiY_PfOhdOLAxWncGwGHSvbMHYQFnoECAMQAg&usg=AOvVaw1G1rklXPpqyKlYrgQbTNTt"><span class="CVA68e qXLe6d">Pure Functions | Scala Book</span> <span class="qXLe6d dXDvrc"> <span class="fYyStc">docs.scala-lang.org › overviews › scala-book › pure-functions</span> </span> </a></div><div class="oO6lG"> <span class="qXLe6d F9iS2e WMQ2Le"> <a class="M3vVJe" href="https://www.google.com/url?q=https://support.google.com/websearch%3Fp%3Dfeatured_snippets%26hl%3Den-SG&opi=89978449&usg=AOvVaw0XmUePKqidLOPpq7KneD4H">About featured snippets</a> </span> </div></div></div> </div> </div><div> <div> <div class="ezO2md"><div><div><a class="fuLhoc ZWRArf" href="/url?q=https://en.wikipedia.org/wiki/Pure_function&sa=U&ved=2ahUKEwiY_PfOhdOLAxWncGwGHSvbMHYQFnoECAkQAg&usg=AOvVaw0G0nx5iGbTs_o2UEqT5Y_w"><span class="CVA68e qXLe6d fuLhoc ZWRArf">Pure function - Wikipedia</span> <span class="qXLe6d dXDvrc"> <span class="fYyStc">en.wikipedia.org › wiki › Pure_function</span> </span> </a></div><div class="Dks9wf"><table class="KZhhub"><tr><td class="udTCfd"><div> <div> <span class="qXLe6d FrIlee"> <span class="fYyStc">In computer programming, a pure function is a function that has the following properties: the function return values are identical for identical arguments ...</span> </span> <span class="qXLe6d FrIlee"> <a class="M3vVJe" href="/url?q=https://en.wikipedia.org/wiki/Pure_function%23Examples&sa=U&ved=2ahUKEwiY_PfOhdOLAxWncGwGHSvbMHYQ0gJ6BAgJEAU&usg=AOvVaw3Jf6yPJ_kBz9E-64kM0u1f">Examples</a> <span class="fYyStc"> · </span> <a class="M3vVJe" href="/url?q=https://en.wikipedia.org/wiki/Pure_function%23I/O_in_pure_functions&sa=U&ved=2ahUKEwiY_PfOhdOLAxWncGwGHSvbMHYQ0gJ6BAgJEAY&usg=AOvVaw0edB973TV4Aey9lB6miNO4">I/O in pure functions</a> <span class="fYyStc"> · </span> <a class="M3vVJe" href="/url?q=https://en.wikipedia.org/wiki/Pure_function%23Memoization&sa=U&ved=2ahUKEwiY_PfOhdOLAxWncGwGHSvbMHYQ0gJ6BAgJEAc&usg=AOvVaw0_6RQJPJz4WzBDefLYNZvl">Memoization</a> <span class="fYyStc"> · </span> <a class="M3vVJe" href="/url?q=https://en.wikipedia.org/wiki/Pure_function%23Compiler_optimizations&sa=U&ved=2ahUKEwiY_PfOhdOLAxWncGwGHSvbMHYQ0gJ6BAgJEAg&usg=AOvVaw0DwuMJ3xbYbVhUvA9AzcUc">Compiler optimizations</a> </span> </div> </div></td></tr></table></div></div></div> </div> </div><div> <div> <div class="ezO2md"><div><div><a class="fuLhoc ZWRArf" href="/url?q=https://www.geeksforgeeks.org/pure-functions-in-javascript/&sa=U&ved=2ahUKEwiY_PfOhdOLAxWncGwGHSvbMHYQFnoECAQQAg&usg=AOvVaw263exSmxA7GIl7qhrW4Slr"><span class="CVA68e qXLe6d fuLhoc ZWRArf">Pure Functions in JavaScript - GeeksforGeeks</span> <span class="qXLe6d dXDvrc"> <span class="fYyStc">www.geeksforgeeks.org › pure-functions-in-javascript</span> </span> </a></div><div class="Dks9wf"><table class="KZhhub"><tr><td class="udTCfd"><div> <div> <span class="qXLe6d FrIlee"> <span class="fYyStc YVIcad">17 Dec 2024</span> <span class="fYyStc YVIcad"> · </span> <span class="fYyStc">A Pure Function is a function (a block of code) that always returns the same result if the same arguments are passed. Pure functions return ...</span> </span> </div> </div></td></tr></table></div></div></div> </div> </div><div> <div> <div class="ezO2md"><div><div><a class="fuLhoc ZWRArf" href="/url?q=https://medium.com/javascript-scene/master-the-javascript-interview-what-is-a-pure-function-d1c076bec976&sa=U&ved=2ahUKEwiY_PfOhdOLAxWncGwGHSvbMHYQFnoECAEQAg&usg=AOvVaw0R0V9tqgCvZTR20PdvfWFE"><span class="CVA68e qXLe6d fuLhoc ZWRArf">Master the JavaScript Interview: What is a Pure Function? - Medium</span> <span class="qXLe6d dXDvrc"> <span class="fYyStc">medium.com › javascript-scene › master-the-javascript-interview-what-is-a-...</span> </span> </a></div><div class="Dks9wf"><table class="KZhhub"><tr><td class="udTCfd"><div> <div> <span class="qXLe6d FrIlee"> <span class="fYyStc YVIcad">25 Mar 2016</span> <span class="fYyStc YVIcad"> · </span> <span class="fYyStc">Pure functions take some input and return some output based on that input. They are the simplest reusable building blocks of code in a program.</span> </span> </div> </div></td></tr></table></div></div></div> </div> </div><div> <div> <div class="ezO2md"><div><div><a class="fuLhoc ZWRArf" href="/url?q=https://stackoverflow.com/questions/55815641/what-exactly-is-a-pure-function-when-we-are-talking-about-a-function-within-a-fu&sa=U&ved=2ahUKEwiY_PfOhdOLAxWncGwGHSvbMHYQFnoECAYQAg&usg=AOvVaw3lQUTrwPbsVEM8RYAcf-8S"><span class="CVA68e qXLe6d fuLhoc ZWRArf">What exactly is a pure function when we are talking about a function ...</span> <span class="qXLe6d dXDvrc"> <span class="fYyStc">stackoverflow.com › questions › what-exactly-is-a-pure-function-when-we...</span> </span> </a></div><div class="Dks9wf"><table class="KZhhub"><tr><td class="udTCfd"><div> <div> <span class="qXLe6d FrIlee"> <span class="fYyStc YVIcad">23 Apr 2019</span> <span class="fYyStc YVIcad"> · </span> <span class="fYyStc">A pure function is a function that meets 2 requirements: Given the same input, it will always return the same output.</span> </span> <span class="qXLe6d FrIlee"> <a class="M3vVJe" href="/url?q=https://stackoverflow.com/questions/22268851/what-is-a-pure-function&sa=U&ved=2ahUKEwiY_PfOhdOLAxWncGwGHSvbMHYQrAJ6BAgGEAY&usg=AOvVaw0tIPoYY8b-z41oHJcXHKBn">What is a pure function? - Stack Overflow</a> </span> <span class="qXLe6d FrIlee"> <a class="M3vVJe" href="/url?q=https://stackoverflow.com/questions/11153796/benefits-of-pure-function&sa=U&ved=2ahUKEwiY_PfOhdOLAxWncGwGHSvbMHYQrAJ6BAgGEAc&usg=AOvVaw2i5N-Rm3-SrDMxjhZddaPZ">Benefits of pure function - Stack Overflow</a> </span> <span class="qXLe6d FrIlee"> <a class="M3vVJe" href="/url?q=https://stackoverflow.com/questions/66124336/is-there-a-performance-penalty-for-using-pure-functions-with-heavy-arguments&sa=U&ved=2ahUKEwiY_PfOhdOLAxWncGwGHSvbMHYQrAJ6BAgGEAg&usg=AOvVaw0UvGsu-1FHVhl_egCjrOa7">Is there a performance penalty for using pure functions with heavy ...</a> </span> <span class="qXLe6d FrIlee"> <a class="M3vVJe" href="/url?q=https://stackoverflow.com/questions/77516467/how-to-correctly-identify-pure-functions-in-functional-programming&sa=U&ved=2ahUKEwiY_PfOhdOLAxWncGwGHSvbMHYQrAJ6BAgGEAk&usg=AOvVaw3Pq4kmm7c-5IXNOtpM-6e8">How to correctly identify pure functions in functional programming?</a> </span> <span class="qXLe6d FrIlee"> <a class="M3vVJe" href="/search?q=pure+functions+site:stackoverflow.com&sca_esv=2eee718c337252b9">More results from stackoverflow.com</a> </span> </div> </div></td></tr></table></div></div></div> </div> </div><div> <div> <div class="ezO2md"><div><div><a class="fuLhoc ZWRArf" href="/url?q=https://react.dev/learn/keeping-components-pure&sa=U&ved=2ahUKEwiY_PfOhdOLAxWncGwGHSvbMHYQFnoECAUQAg&usg=AOvVaw1lUXcgNNfGH0Y4TLZP-RtE"><span class="CVA68e qXLe6d fuLhoc ZWRArf">Keeping Components Pure - React</span> <span class="qXLe6d dXDvrc"> <span class="fYyStc">react.dev › learn › keeping-components-pure</span> </span> </a></div><div class="Dks9wf"><table class="KZhhub"><tr><td class="udTCfd"><div> <div> <span class="qXLe6d FrIlee"> <span class="fYyStc">Some JavaScript functions are pure. Pure functions only perform a calculation and nothing more. By strictly only writing your components as pure functions ...</span> </span> </div> </div></td></tr></table></div></div></div> </div> </div><div> <div> <div class="ezO2md"><div><div> <span class="qXLe6d x3G5ab"> <a class="dloBPe x3G5ab" href="https://www.google.com/search?sca_esv=2eee718c337252b9&ei=SYq3Z9izNqfhseMPq7bDsQc&q=pure+functions&tbm=isch&sa=X&ved=2ahUKEwiY_PfOhdOLAxWncGwGHSvbMHYQsAR6BAgCEAE">Images</a> </span> <span class="qXLe6d F9iS2e"> <a class="M3vVJe" href="https://www.google.com/search?sca_esv=2eee718c337252b9&ei=SYq3Z9izNqfhseMPq7bDsQc&q=pure+functions&tbm=isch&sa=X&ved=2ahUKEwiY_PfOhdOLAxWncGwGHSvbMHYQ7Al6BAgCEAI">View all</a> </span> <div class="dBt03e"> <a class="UwfKSd" href="https://www.google.com/imgres?imgurl=https://cdn-media-1.freecodecamp.org/images/0*a_yub2gTwY-1eK8j.png&imgrefurl=https://www.freecodecamp.org/news/what-is-a-pure-function-in-javascript-acb887375dfe/&h=771&w=737&tbnid=OZUx99YtZG-7IM&q=pure+functions&tbnh=142&tbnw=136&usg=AI4_-kSLCt2xhIdHvyZlXRT3bjqF1Ap2pg&vet=1&docid=KLFh9NIM01ZJHM&sa=X&ved=2ahUKEwiY_PfOhdOLAxWncGwGHSvbMHYQ9QF6BAgCEAQ"> <div class="CO79Sb"> <img class="iUhyd" alt="What Is a Pure Function in JavaScript?" src="https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcQAeun7idNsX_E_hRwgbVKOo61GqJcwPMVd1dvbPdNGix3PCVJVwLwt6UI&s" style="width:86px;height:90px"/> </div> </a> <a class="UwfKSd" href="https://www.google.com/imgres?imgurl=https://miro.medium.com/v2/resize:fit:1400/1*fgISuw7tNhiznpByJIDhIQ.png&imgrefurl=https://medium.com/geekculture/pure-vs-impure-functions-3f8693edf69b&h=700&w=1400&tbnid=gLVdWh8MODv72M&q=pure+functions&tbnh=75&tbnw=150&usg=AI4_-kQhjkXRiRuwQer0stNwcqL6ti-9uQ&vet=1&docid=MpcyYpoJ-OVjGM&sa=X&ved=2ahUKEwiY_PfOhdOLAxWncGwGHSvbMHYQ9QF6BAgCEAY"> <div class="CO79Sb"> <img class="iUhyd" alt="Pure vs Impure Functions. 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- freeCodeCamp</span> <span class="qXLe6d dXDvrc"> <span class="fYyStc">www.freecodecamp.org › news › what-is-a-pure-function-in-javascript-acb...</span> </span> </a></div><div class="Dks9wf"><table class="KZhhub"><tr><td class="udTCfd"><div> <div> <span class="qXLe6d FrIlee"> <span class="fYyStc YVIcad">3 Jan 2019</span> <span class="fYyStc YVIcad"> · </span> <span class="fYyStc">Pure functions are the atomic building blocks in functional programming. They are adored for their simplicity and testability.</span> </span> </div> </div></td></tr></table></div></div></div> </div> </div><div> <div> <div class="ezO2md"><div><div><a class="fuLhoc ZWRArf" href="/url?q=https://dev.to/kjdowns/what-s-a-pure-function-205e&sa=U&ved=2ahUKEwiY_PfOhdOLAxWncGwGHSvbMHYQFnoECAsQAg&usg=AOvVaw1abBf2mrfQsLN4a4RsHgBF"><span class="CVA68e qXLe6d fuLhoc ZWRArf">What's a Pure Function? - DEV Community</span> <span class="qXLe6d dXDvrc"> <span class="fYyStc">dev.to › kjdowns › what-s-a-pure-function-205e</span> </span> </a></div><div class="Dks9wf"><table class="KZhhub"><tr><td class="udTCfd"><div> <div> <span class="qXLe6d FrIlee"> <span class="fYyStc YVIcad">20 Jul 2020</span> <span class="fYyStc YVIcad"> · </span> <span class="fYyStc">Pure functions are a great way to tidy up your code and they are a great way to keep your code scalable and bug free.</span> </span> </div> </div></td></tr></table></div></div></div> </div> </div><div> <div> <div 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