10/30/2023 0 Comments Reduce map filter javascriptThat function (for this example) takes one parameter (here: celsius).filter() example, the array size of the original array and the output array is always the same when we use the. Having the following array of people with an age.Įnter fullscreen mode Exit fullscreen mode Or in other words: Take out the items we don't want. It does exactly what it says - It takes the existing array and returns a part of that array back, possibly skipping some value. On the inside, these functions run a forEach loop and then apply the passed function in one way or another to the data it's iterating. That is very important to understand for this lesson. That means that they are a function which return functions as results or take other functions as parameters. Read the first chapter of my blog post on array functions and you should be good to go for understanding what's going on here.Īll three functions were introduced in ES6 (ECMAScript 2015) and are functions that are applied to an Array.Īlso, all of them as so-called higher-order functions. If you don't know what they are, don't worry. This post assumes you know about arrow functions. In this post, I'll cover each one with examples of first the "old" way, then with these new functions. The most popular for doing daily tasks are. One of which are a few very handy Array functions.
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