Web Reference: Jul 20, 2025 · 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 · By Kenechukwu Nwobodo In this article I'm going to explain how to use the new array methods introduced in ES2019 (EcmaScript 2019) – 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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