[RxJS] AsyncSubject and ReplaySubject - Learn the Differences
We can use Subject as Observable and Observer:
// Subject should be only used to emit value for private
// Using subject as an Observer
const subject = new Subject(); subject.next(1);
subject.next(2);
subject.next(3); // Using subject as an Observable
const source$ = subject.asObservable(); source$.subscribe(console.log);
AsyncSubject:
AsyncSubject only subscribe the latest value before subject complete.
const as = new AsyncSubject(); as.next(1);
as.next(2);
as.next(3);
as.complete(); // it is necessary to complete it in order to get last value const source$ = as.asObservable(); source$.subscribe(console.log); //
If we don't call 'as.complete()', we won't get any value in the console.
Different from AsyncSubject, we have ReplySubject:
It doesn't need to call complete() in order to emit value. And it emit all the values from every beginning.
const rs = new ReplaySubject(); rs.next(1);
rs.next(2);
rs.next(3); const source$ = as.asObservable(); source$.subscribe(console.log); // 1,2,3
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