Web Reference: Jul 20, 2025 ยท The flatMap () method of Array instances returns a new array formed by applying a given callback function to each element of the array, and then flattening the result by one level. Jul 26, 2022 ยท In this article I'm going to explain how to use the new array methods introduced in ES2019 (EcmaScript 2019) โ flat() and flatMap(). You use these methods to flatten arrays. Description The flatMap() method maps all array elements and creates a new flat array. flatMap() creates a new array from calling a function for every array element. flatMap() does not execute the function for empty elements. flatMap() does not change the original array.
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