Web Reference: Jul 10, 2025 · The flat () method of Array instances creates a new array with all sub-array elements concatenated into it recursively up to the specified depth. Browser Support JavaScript Array flat() is supported in all modern browsers since January 2020: 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.
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