To write Reactive programs, we need a library or a specific programming language; we can't refer to Kotlin as a reactive language (basically, I don't know any such language that is reactive by itself) as it is a powerful and flexible programming language for modern multiplatform applications, fully interoperable with Java and Android. However, there are reactive libraries out there to help us with these. So, let's take a look at the available list:
- RxKotlin
- Reactor-Kotlin
- Redux-Kotlin
- FunKTionale
- RxJava and other Reactive Java Frameworks can also be used with Kotlin (as Kotlin is 100% interoperable with Java-bidirectional)
In this book, we will focus on RxJava and Reactor-kotlin (in the later chapters, on Spring).