Talking about Chapter 3, Subjects in the RxSwift book.

Discussing what are Subjects, how they are different from our plain observables, the different kinds available to us. Lastly discussed Relay in RxSwift and the two kinds of Relays available.

This book by Ray Wenderlich acts as a complete guide toward learning and mastering reactive programming and asynchronous programming. This is currently using Swift 5.1 and iOS 13.

Links:

Step Into Swift: https://www.stepintoswift.com/

https://www.raywenderlich.com/books/rxswift-reactive-programming-with-swift