In this chapter, we learned about what reactive programming is and the reasons we should learn it. We also started with coding. The reactive coding pattern may seem new or somehow uncommon, but it is not that hard; while using it, you just need to declare a few more things.
We learned about observable and its use. We also got introduced to subject and map, which we will learn in depth in the later chapters.
We will continue with ReactiveCalculator example in the later chapters and see how we can optimize and enhance this program.
The three examples presented in this chapter may seem a bit confusing and complex at first, but they're really simple, and they will become familiar to you as you proceed with this book.
In the next chapter, we will learn more about functional programming and functional interfaces in RxKotlin.
