'map' transforms data; 'flatMap' transforms data into a new Publisher.
In reactive streams, 'map' is used for one-to-one transformations, while 'flatMap' is for one-to-many transformations, often leading to new asynchronous processing. For example, 'map' can convert product prices from USD to EUR, while 'flatMap' can fetch detailed product reviews for each product asynchronously.
Additional Notes
How do ‘map’ and ‘flatMap’ differ in reactive streams?
Track: Java
Topic: Reactive Streams
Focus: Blocking the Event Loop
Topics:Blocking the Event LoopJavaReactive Streams