Web Reference: Welcome to Day 7 of the 75 Days JavaScript Machine Coding Challenge! 🚀 In today’s session, we dive deep into writing polyfills for map () and forEach () methods in JavaScript. Dec 23, 2015 · It’s this simple: .map returns a new array, whereas .forEach doesn’t return anything. Basically, if you want to obtain a modified form of the previous array, you use .map, if you don’t want that, you use .forEach. The forEach() method calls a function (a callback function) once for each array element. Note that the function takes 3 arguments: The example above uses only the value parameter. The example can be rewritten to: The map() method creates a new array by performing a function on each array element.
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