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. JavaScript Array flat() is supported in all modern browsers since January 2020: Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, Python, PHP, Bootstrap, Java, XML and more. 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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