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Learning RxJava

Learning RxJava

By : Nield
5 (10)
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Learning RxJava

Learning RxJava

5 (10)
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)
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Using let() and apply()

In Kotlin, every type has a let() and apply() extension function. These are two simple but helpful tools to make your code more fluent and expressive.

Using let()

let() simply accepts a lambda that maps the invoked object T to another object R. It is similar to how RxJava offers the to() operator, but it applies to any type T and not just Observables/Flowables. For example, we can call let() on a string that has been lowercased and then immediately do any arbitrary transformation on it, such as concatenating its reversed() string to it. Take a look at this operation:

fun main(args: Array<String>) {

val str = "GAMMA"

val lowerCaseWithReversed = str.toLowerCase().let...

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