JavaScript Map Function Explained: A Deep Dive

The map function takes a function definition as its first argument (required) The function whose definition we pass in will have 3 arguments available to it and will be called for each element in the original array. There is also an optional second parameter to the map function that we will go over later. Later in the article, we will do a deep dive into some more advanced concepts regarding map function and its uses. We are going to walk through the JavaScript map function, and explain how it works in a simple way.