{"id":7293,"date":"2022-06-16T13:54:09","date_gmt":"2022-06-16T08:24:09","guid":{"rendered":"https:\/\/www.innovationm.com\/blog\/?p=7293"},"modified":"2023-01-20T18:54:53","modified_gmt":"2023-01-20T13:24:53","slug":"currying-in-javascript-2","status":"publish","type":"post","link":"https:\/\/www.innovationm.com\/blog\/currying-in-javascript-2\/","title":{"rendered":"Currying in JavaScript"},"content":{"rendered":"<h3>What is currying?<\/h3>\n<p>Currying is a technique of evaluating a function with <em>multiple arguments<\/em>, into a sequence of functions with a single argument.<\/p>\n<p>OR<\/p>\n<p>In other words, while a function, rather than taking all arguments at one time, takes the primary one and goes back to a new function that takes the second and returns a new function which takes the third one, and so forth, till all arguments have been fulfilled.<\/p>\n<p><strong>Why is it useful?<\/strong><\/p>\n<ol>\n<li>a) It helps to avoid passing the same variable again and again.<\/li>\n<li>b) It is extremely useful in event handling.<\/li>\n<li>c) Code can be configured and reused with ease<\/li>\n<\/ol>\n<p><strong>Syntax:<\/strong><\/p>\n<pre class=\"lang:default decode:true \">function Myfunction(a) {\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 return (b) =&gt; {\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 return (c) =&gt; {\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 return a * b * c\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }<\/pre>\n<h3><strong>Example1<\/strong><\/h3>\n<p>In the following example ,considering the fact that currying is used,parameters have been passed one by one(volume(11)(2)(3))\u00a0 till the remaining function is referred to as the last parameter.<\/p>\n<pre class=\"lang:default decode:true \">function volume(length) {\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0 return function(width) {\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 return function(height) {\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 return height * width * length;\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0 }\r\n\r\n\u00a0\u00a0 }<\/pre>\n<p>console.log(volume(11)(2)(3));<\/p>\n<h3><strong>Example2<\/strong><\/h3>\n<pre class=\"lang:default decode:true\">function curriedAddTwo(a) {\r\n\r\n\u00a0 return function (b) {\r\n\r\n\u00a0\u00a0\u00a0 return a + b;\r\n\r\n\u00a0\u00a0};\r\n\r\n};<\/pre>\n<p>console.log(curriedAddTwo(1)(2)) \/\/ evaluates to 3<\/p>\n<p><strong>The function above works as followed:<\/strong><\/p>\n<ul>\n<li>curriedAddTwo() is declared, accepting a single parameter a;<\/li>\n<li>when called, curriedAddTwo() is provided the argument 1, returning a new nameless function that accepts a single parameter b;<\/li>\n<li>The returned function (step 2) is called straight away with argument 2, returning the expected value 1+2.<\/li>\n<\/ul>\n<p>By definition, a curried function is one that takes many parameters and returns a function with a fixed arity of 1. Although that can sound confusing, it actually means that a curried function will constantly go back to a function that takes exactly 1 argument. As a result of this, we have to pass in arguments in individual parenthesis blocks, or our function will now no longer work.<\/p>\n<p><strong>How does currying work?<\/strong><\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone  wp-image-7295\" src=\"https:\/\/www.innovationm.com\/blog\/wp-content\/uploads\/2022\/06\/b1-2-300x203.png\" alt=\"\" width=\"355\" height=\"240\" srcset=\"https:\/\/www.innovationm.com\/blog\/wp-content\/uploads\/2022\/06\/b1-2-300x203.png 300w, https:\/\/www.innovationm.com\/blog\/wp-content\/uploads\/2022\/06\/b1-2.png 432w\" sizes=\"(max-width: 355px) 100vw, 355px\" \/><\/p>\n<p>Currying works by natural closure. The closure is created by the nested functions to maintain access to each of the arguments. So inner functions have access to all arguments.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>What is currying? Currying is a technique of evaluating a function with multiple arguments, into a sequence of functions with a single argument. OR In other words, while a function, rather than taking all arguments at one time, takes the primary one and goes back to a new function that takes the second and returns [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":7294,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[360],"tags":[722,780,224,346],"class_list":["post-7293","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-javascript","tag-blog","tag-currying","tag-java","tag-javascript"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Currying in JavaScript - InnovationM - Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.innovationm.com\/blog\/currying-in-javascript-2\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Currying in JavaScript - InnovationM - Blog\" \/>\n<meta property=\"og:description\" content=\"What is currying? 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