flatMap
The flatmap is a operator is an operator in reactive programming particularly in Project Reactor and RxJava, that transforms each element emitted by a source publisher into new publisher then flattens these inner publisher instance into a single publisher and It allows asynchronous processing of each element and merges the result.
When to Use flatMap:
We use flatmap operator on publisher to handle the business means It can handle every event in the publisher. Below we provide the different situations to use flatmap operator in reactive programming.
- Asynchronous Processing: When you need to perform an asynchronous operation of each element like fetching data from a remote service for each item.
- Transforming Elements: When the transformation of elements involves producing multiple values or another reactive stream.
- Merging Results: When you need to merge the results of multiple asynchronous operations into single stream.
What are flatmap and switchifempty in Spring Reactive?
Spring WebFlux is a part of the Spring Framework that provides reactive programming support for web applications. It introduces reactive types like Mono and Flux publishers which are fundamental to its programming model. Mono and Flux play crucial roles in reactive programming. The reactive programming introduces a lot of operators to handle the business logic like flatmap, onErrorResume, map, zip, just, and other reactor operators. In this article, we explain what flatmap and switchIfEmpty.
Prerequisites:
To understand this content, you should know the topics below are easy to understand.
- Spring Framework
- Spring Reactor Programming
- Publisher and Consumer Concepts
- Event flow in Reactive Streams
- Operators in Spring Reactor
- Concept of Subscription
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