Web Reference: Jul 20, 2025 · 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. Jul 26, 2022 · Rather here, we'll discuss the new flat() and flatMap() methods you can use to convert an original array into a new array. You use the flat method to convert an original array into a new array. It does this by collecting and concatenating the sub-arrays in an array into a single array. Description The flatMap() method maps all array elements and creates a new flat array. flatMap() creates a new array from calling a function for every array element. flatMap() does not execute the function for empty elements. flatMap() does not change the original array.
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