Reactive Streams · interview question
How does flatMap differ from map in reactive streams?
Multiple choiceMediumchapter-19-curatedpremiumreactive-streamsblocking-the-event-loop
Answer and explanation
Correct answer
C. FlatMap flattens the stream by mapping each element to a stream.
Why
flatMap is used when each element of the original stream needs to be transformed into a new stream, and those streams need to be flattened into a single stream. This is useful for chaining asynchronous operations.
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