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behaviorsubject vs subject Angular

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Aamir Farooq answered on October 25, 2021 Popularity 10/10 Helpfulness 1/10

answer behaviorsubject vs subject Angular

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behaviorsubject vs subject Angular

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A BehaviorSubject holds one value. When it is subscribed it emits the value immediately.
 A Subject doesn't hold a value.

Subject example (with RxJS 5 API):

const subject = new Rx.Subject();
subject.next(1);
subject.subscribe(x => console.log(x));

BehaviorSubject example:
const subject = new Rx.Subject();
subject.next(1);
subject.subscribe(x => console.log(x));

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Source: stackoverflow.com

Tags: angular behaviorsubject subject whatever

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Contributed on Oct 25 2021

Aamir Farooq

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// Behavior Subject

// a is an initial value. if there is a subscription 
// after this, it would get "a" value immediately
let bSubject = new BehaviorSubject("a"); 

bSubject.next("b");

bSubject.subscribe(value => {
  console.log("Subscription got", value); // Subscription got b, 
                                          // ^ This would not happen 
                                          // for a generic observable 
                                          // or generic subject by default
});

bSubject.next("c"); // Subscription got c
bSubject.next("d"); // Subscription got d

Popularity 10/10 Helpfulness 4/10 Language javascript

Source: stackoverflow.com

Tags: angular

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Contributed on Sep 28 2022

Arsen Tabaku

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behaviorsubject vs subject Angular

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