JavaScript has some handy methods which help us iterate through our arrays. The
two most commonly used for iteration are Array.prototype.map() and
Array.prototype.forEach().

But I think that they remain a little bit unclear, especially for a beginner.
Because they both do an iteration and output something. So, what is the
difference?

In this article, we'll look at the following:

* Definitions
* The returning value
* Ability to chain other methods
* Mutability
* Performance Speed
* Fin

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