Web Reference: ES2019 added the Array flatMap() method to JavaScript. The flatMap() method first maps all elements of an array and then creates a new array by flattening the array. Aug 5, 2025 · To help you perform common tasks efficiently, JavaScript provides a wide variety of array methods. These methods allow you to add, remove, find, and transform array elements with ease. But the built-in Array objects has a lot more to offer, so in this article, we'll go through all the most useful methods found on the Array object. I will leave out only the most obscure methods, but for a full list of the methods, have a look at this reference.
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