Asked by Holland Harrington on Dec 11, 2021 JavaScript
Reactive Extensions Library for JavaScript RxJS is a library for reactive programming using Observables, to make it easier to compose asynchronous or callback-based code.
Keeping this in consideration, 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 Docs). RxJS provides an implementation of the Observable type, which is needed until the type becomes part of the language and until browsers support it. Moreover, RxJS is a javascript library that uses observables to work with reactive programming that deals with asynchronous data calls, callbacks and event-based programs. RxJS can be used with other javascript libraries and frameworks. It is supported by Javascript and also with typescript. Additionally, RxJS Subject is a special type of Observable that allows values to be multicasted to many Observers. While plain Observables are unicast (each subscribed Observer owns an independent execution of the Observable), Subjects are multicast. A subject in RxJS is a special hybrid that can act as both an Observable and an Observer at the same time. In fact, What makes RxJS powerful is its ability to produce values using pure functions. That means your code is less prone to errors. Normally you would create an impure function, where other pieces of your code can mess up your state.
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