{"id":6797,"date":"2020-04-07T23:04:30","date_gmt":"2020-04-07T17:34:30","guid":{"rendered":"https:\/\/code4developers.com\/?p=6797"},"modified":"2020-05-10T19:27:33","modified_gmt":"2020-05-10T13:57:33","slug":"functional-programming-currying","status":"publish","type":"post","link":"https:\/\/code4developers.com\/functional-programming-currying\/","title":{"rendered":"Functional Programming in Javascript – Currying"},"content":{"rendered":"
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Currying<\/a> is an advanced technique of working with functions. It\u2019s used not only in JavaScript, but in other languages as well.<\/span><\/h1>\n<\/div>\n<\/header>\n
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Currying is a transformation of functions that translates a function from callable as\u00a0f(a, b, c)<\/strong> \u00a0into callable as\u00a0f(a)(b)(c)<\/strong>.
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\nCurrying doesn\u2019t call a function. It just transforms it.Let\u2019s see an example first, to better understand what we\u2019re talking about, and then practical applications.We\u2019ll create a helper function\u00a0curry(f)<\/strong>\u00a0that performs currying for a two-argument\u00a0f<\/strong>. In other words,\u00a0curry(f)<\/strong>\u00a0for two-argument\u00a0f(a, b)<\/strong>\u00a0translates it into a function that runs as\u00a0f(a)(b)<\/strong>:<\/p>\n
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function curry(f) { \/\/ curry(f) does the currying transform\r\n  return function(a) {\r\n    return function(b) {\r\n      return f(a, b);\r\n    };\r\n  };\r\n}\r\n\r\n\/\/ usage\r\nfunction sum(a, b) {\r\n  return a + b;\r\n}\r\n\r\nlet curriedSum = curry(sum);\r\n\r\nalert( curriedSum(1)(2) ); \/\/ 3<\/pre>\n<\/div>\n<\/div>\n<\/div>\n
As you can see, the implementation is straightforward: it\u2019s just two wrappers.<\/p>\n