BehaviorSubject | BehaviorSubject vs Subject | RxJS BehaviorSubject - Angular (Tutorial 32)

Описание: In this video, we are going to learn about BehaviorSubject in RxJS. How BehaviorSubject different from normal Subject in RxJS with example.

There are 3 variants of Subject:
1) BehaviorSubject
2) ReplaySubject
3) AsyncSubject

BehaviorSubject is a special type of Subject whose only different is that it will emit the last value upon a new observer's subscription.
A BehaviorSubject holds one value. When it is subscribed it emits the value immediately. A Subject doesn't hold a value.

BehaviorSubject is the most used subject in Angular application. There is one state management library in Angular ngRX, which is completely designed on BehaviorSubject.
In angular application, if you requirement is to pass some initial value to your subscriber even without publishing the data, or you want your subscriber should always get some data even before the subscription. Then behaviorSubject is the solution.

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

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