Web Reference: Jul 26, 2022 · 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. Jul 23, 2025 · In JavaScript, Array.prototype.map () and Array.prototype.flatMap () are both the methods used to the transform elements in arrays but they differ in their behaviors regarding handling and flattening of the nested arrays. Jan 25, 2024 · Use flat () when you need to flatten nested arrays without transforming the elements. Use flatMap () when you need to first transform the elements and then flatten the result.
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