Small Overview About RXJS?

Question

What is RXJS?

RxJs stands for Reactive Extensions for Javascript, and its an implementation of Observables for Javascript. If Observables make it into ES7, you could see RxJs more or less as a pollyfill.​

It which brings the concept of Observables, which we know and love a lot in a lot of server side technologies, to Javascript world. Angular2 team are moving towards Observables instead of Javascript Promises for Http and Form data.

In ReactiveX an observer subscribes to an Observable. Then that observer reacts to whatever item or sequence of items the Observable emits. This pattern facilitates concurrent operations because it does not need to block while waiting for the Observable to emit objects, but instead it creates a sentry in the form of an observer that stands ready to react appropriately at whatever future time the Observable does so.

The main purpose of using Observables is to observe the behaviour of a variable. In an imperative way, a variable is only changed when its state is mutated by assigning a new or updated value.

Observables follow the Observer pattern, where a single piece of state (the Observable) is watched by one or more Observers which can react as it changes over time.

 

Video for RXJS?