Web Reference: Browser Support JavaScript Array flat() is supported in all modern browsers since January 2020: Jul 10, 2025 · The flat() method is a copying method. It does not alter this but instead returns a shallow copy that contains the same elements as the ones from the original array. The flat() method removes empty slots if the array being flattened is sparse. Jul 26, 2022 · You use the flat() method for concatenating sub-arrays recursively into a single array. The flat() method takes a depth value as its parameter which is optional depending on the depth of the array you wish to flatten (concatenate).
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