Web Reference: Jul 26, 2022 ยท By Kenechukwu Nwobodo 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. 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. Mar 22, 2023 ยท Thankfully, ECMAScript 2019 introduced two new methods, flat () and flatMap (), that make it easier to work with multidimensional arrays. In this article, we'll explore how to use these methods to flatten arrays effectively.
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