Not only is it faster but it returns a new Array. Note that you would never return from a forEach function as the return values are simply discarded: arr.forEach((num, index) => ) // a // b // c // dĪnd map() might be preferable when changing or altering data. If we wanted to double each element in the array, we could use either map or forEach. The difference is that map() utilizes return values and actually returns a new Array of the same size. Meanwhile, the map() method will also call a provided function on every element in the array. This callback is allowed to mutate the calling array. It simply calls a provided function on each element in your array. Well, the forEach() method doesn’t actually return anything (undefined). map() - creates a new array with the results of calling a provided function on every element in the calling array.forEach() - executes a provided function once for each array element.Let’s first take a look at the definitions on MDN:

So, what’s the difference? Map & ForEach Defined

If you’ve worked with JavaScript for a little while, you’ve probably come across two seemingly similar Array methods: () and (). Want to learn more Advanced JavaScript? Check out: JavaScript - Understanding the Weird Parts

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