Web Reference: 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. Jul 20, 2025 · flatMap can be used as a way to add and remove items (modify the number of items) during a map. In other words, it allows you to map many items to many items (by handling each input item separately), rather than always one-to-one. In this sense, it works like the opposite of filter. 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.
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