GoF (Gang of Four) Design Patterns Observer Pattern <http…

RxJava - The Observer Pattern On Steroids:

<https://youtu.be/Qlln2uD0Jaw>

RxJS : Observer, Observables, and Subscriptions

<https://youtu.be/Tux1nhBPl_w>

RxSwift :

https://engineering.upgrad.com/introduction-to-reactive-programming-using-rxswift-a949b023400d

<https://youtu.be/2m92mRI8l7U>

The thing about Rx is it works almost the same across all languages.