Downloading and setting up RxKotlin

You can download and build RxKotlin from GitHub (https://github.com/ReactiveX/RxKotlin). I do not require any other dependencies. The documentation on the GitHub wiki page is well structured. Here's how you can check out the project from GitHub and run the build:

$ git clone https://github.com/ReactiveX/RxKotlin.git
$ cd RxKotlin/
$ ./gradlew build

You can also use Maven and Gradle, as instructed on the page.

For Gradle, use the following compile dependency:

compile 'io.reactivex.rxjava2:rxkotlin:2.x.y' 

For Maven, use this dependency:

    <dependency> 
      <groupId>io.reactivex.rxjava2</groupId> 
      <artifactId>rxkotlin</artifactId> 
      <version>2.x.y</version> 
    </dependency> 

This book targets RxKotlin 2.x, so remember to use io.reactive.rxjava2 instead of io.reactivex.rxkotlin, as the latter one is for RxKotlin 1.x.

Note that we are using RxKotlin version 2.1.0 for this book.

Now, let's take a look at what RxKotlin is all about. We will begin with something well-known and, gradually, we will get into the secrets of the library.