Observables in a Nutshell
Explore how observables work in Angular to handle asynchronous events using the observer pattern. Understand how to create and subscribe to observables to respond to data or state changes in real time. This lesson helps you grasp reactive programming fundamentals and apply them with RxJS for dynamic application behavior.
We'll cover the following...
An observable is an object that maintains a list of dependents, called observers, and informs them about state and data changes by emitting events asynchronously. To do so, the observable implements all the machinery it needs to produce and emit such events. It can be fired and canceled at any time, regardless of whether it has emitted the expected data already.
Observers need to subscribe to an observable to be notified and react to reflect the state change. This pattern, known as the observer pattern, allows concurrent operations and more advanced logic. These observers, also known as subscribers, keep listening to whatever happens in the observable until it is destroyed. We can see ...