RxJS Subject | What is RxJs Subject - Angular (Tutorial 31)

In this video, we are going to learn about Subject in RxJS. How Subject works in Rxjs with example.

While communication between components or retrieving data, We often use Observable , there are some drawbacks associated with observable and in those situation Subject can be used.

A Subject is like observable. But the main difference between Observable and Subject is that Observables are unicast and on other side Subjects are multicast


.
Uni-casting mean that each subscribed observer owns an independent execution of the Observable and this could be really messy if you expect that each subscriber should receive the same values.

Subjects can help us overcome this issue because Subjects can multicast.
Multicast means that one Observable execution is shared among multiple subscriber. You can think Subject like a EventEmitters, like we have button and on-click of that button handler will called, so here doesn’t matter how many time event will emit it will call the same handler.
Similarly in case of Subject, when we call subscribe method on subject, it doesn't invoke new execution instead it simply registers the given observer in list of observers.

So in simple we can say
Observable by default is one to one.
And Subject are one to many…Subject acts like a radio broadcast system which reflects all the program to all of its subscribers every time.

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This code is available on github (Branch Name:) feature/rxjsSubject
https://github.com/nishaSingla/Angula...

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I have used below FAKE API in demo to illustrate the Subject:
https://jsonplaceholder.typicode.com/...

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