When/why to use map/reduce over for loops

Question

So I am getting into a bit of object manipulation in JavaScript for the first time and I have a question I\'m wondering if anyone could answer.

When I have an object

Answer 1

forEach(): Executes a provided function(callback) once for each array element. Doesn’t return anything (undefined) but this callback is allowed to mutate the calling array.

map(): Executes a provided function(callback) once for each array element and creates a new array with the results of this executions. It cannot mutate the calling array content.

Conclution Use map() when you need to return a new array, use forEach() or for when you want to change the original array.