Angular has many types of Observables which you can use. Maybe you’ve seen RxJS methods like Subject, BehaviourSubject, ReplaySubject, or AsyncSubject in Angular. In this post, I want to dive deeper into what those types of Subjects are and when you should use them. So buckle up and enjoy the ride.

In Angular, you can perform asynchronous actions in two different ways, Observables, and Promises. Most people pick Observables because every example on blogs and documentation tells you to do so. But why? Are Promises that bad? Or Observables that good?

Angular is full of Observables. But is there is a mechanism that automatically unsubscribes your Observables when components get destroyed? Yes there is! You can use the async pipe or the takeUnitl method.