Book Image

Learning RxJava

By : Nield
Book Image

Learning RxJava

By: Nield

Overview of this book

RxJava is a library for composing asynchronous and event-based programs using Observable sequences for the JVM, allowing developers to build robust applications in less time. Learning RxJava addresses all the fundamentals of reactive programming to help readers write reactive code, as well as teach them an effective approach to designing and implementing reactive libraries and applications. Starting with a brief introduction to reactive programming concepts, there is an overview of Observables and Observers, the core components of RxJava, and how to combine different streams of data and events together. You will also learn simpler ways to achieve concurrency and remain highly performant, with no need for synchronization. Later on, we will leverage backpressure and other strategies to cope with rapidly-producing sources to prevent bottlenecks in your application. After covering custom operators, testing, and debugging, the book dives into hands-on examples using RxJava on Android as well as Kotlin.
Table of Contents (14 chapters)

Merging

A common task done in ReactiveX is taking two or more Observable<T> instances and merging them into one Observable<T>. This merged Observable<T> will subscribe to all of its merged sources simultaneously, making it effective for merging both finite and infinite Observables. There are a few ways that we can leverage this merging behavior using factories as well as operators.

Observable.merge() and mergeWith()

The Observable.merge() operator will take two or more Observable<T> sources emitting the same type T and then consolidate them into a single Observable<T>.

If we have only two to four Observable<T> sources to merge, you can pass each one as an argument to the Observable...