RxCocoa, RxSwift, Bond, Interstellar

While you can use any functional library, I personally prefer RxSwift because I have the most experience with it. However, there are many reactive libraries out there such as RxCocoa, RxSwift, Bond, Interstellar, and more. Here, we will be using RxSwift for bindings.

https://academy.realm.io/posts/mobilization-lukasz-mroz-mvvm-coordinators-rxswift/

Functional Reactive Programming