Java Streams Intermediate Operation mapMulti()

Published: 02 October 2023
on channel: Douglas Schmidt

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This video discusses mapMulti(), which is an intermediate operation introduced in Java 16's Stream API. It serves as a flexible, stateless method that combines the functionalities of map(), filter(), and flatMap(). Unlike flatMap(), which doesn't work properly with parallel streams, mapMulti() efficiently handles them, running inner parallel streams as intended. The method can replace multiple calls to map() and filter(), reduce intermediate collections, and deal with null or empty values. A short example showcases mapMulti()'s ability to streamline complex stream operations by consolidating multiple tasks into a single intermediate operation call.

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