RxJS (Reactive Extensions for JavaScript) is a library for reactive programming using observables that makes it easier to compose asynchronous or callback-based code. … RxJS provides an implementation of the Observable type, which is needed until the type becomes part of the language and until browsers support it.

What is the benefit of RxJS?

RxJS provides a high-quality optimization and has a modular architecture. These characteristics make it small, and the production bundle contains only those parts that are used. RxJS does not depend on any third-party. It has a self-sufficient library, which doesn’t import other parties of dependencies.

Why should I use observables?

They can only emit (reject, resolve) a single value. On the other hand, observables can emit multiple results. The subscriber will be receiving results until the observer is completed or unsubscribed from. … That makes Observables a great tool for listening to streams of data.