Web Reference: 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. 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. Nov 10, 2025 · We have the map () and flatMap () methods among other aggregate operations. Even though both have the same return types, they are quite different. Let’s explain these differences by analyzing some examples of streams and optionals.
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