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. In this sense, it works like the opposite of filter. Mar 22, 2023 · These methods are powerful tools for working with nested arrays in JavaScript. They allow you to flatten arrays up to a specified depth and simplify the process of mapping and flattening simultaneously. I already tried to play around with flatMap. It works, if I only want the c portion of my nested object, but I don't know how to map a and b to this object. As some of you asked for some working code, this should do it (untested):
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