Observables and Subscribers

We already got a glimpse into the Observable and how it works in Chapter 1, Thinking Reactively. You probably have many questions on how exactly it operates and what practical applications it holds. This chapter will provide a foundation for understanding how an Observable works as well as the critical relationship it has with the Observer. We will also cover several ways to create an Observable as well make it useful by covering a few operators. To make the rest of the book flow smoothly, we will also cover all critical nuances head-on to build a solid foundation and not leave you with surprises later.

Here is what we will cover in this chapter:

• The Observable
• The Observer
• Other Observable factories
• Single, Completable, and Maybe
• Disposable