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. The FlatMap operator transforms an Observable by applying a function that you specify to each item emitted by the source Observable, where that function returns an Observable that itself emits items. The flatMap Operator The flatMap operator transforms the elements emitted by a Publisher asynchronously by applying a function that returns the values emitted by inner publishers.
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