map() - JavaScript Array Methods

Published: 12 January 2020
on channel: Mackley Studios

map() is a very important array method to know. Call it on an array, and it will map over each element in the array, and call a function on it. It will then produce a new array as a result. The result array may have nothing or very little to do with the original array. All it says, in essence is, "Do something for each value in the array and place a result in the same index of a new array." This pattern allows you to write an operation that uses your array, while keeping it immutable. Instead of modifying the original array, a new array is created. This is a useful part of functional programming, a type of programming by which we call functions on data and create new modified copies, without changing the state of the original objects and arrays. I find that map() is very useful when changing the format of data. Often, I will retrieve data from a database or from some other service, but it might be in the wrong format. Calling map() on it, allows me to quickly, and cleanly, format it for the frontend of a website or app, or to prepared it to be served by an API.

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