function
stable
Returns a ConnectableObservable, which is a variety of Observable that waits until its connect method is called before it begins emitting items to those Observers that have subscribed to it.
publish<T, R>(selector?: OperatorFunction<T, R>): MonoTypeOperatorFunction<T> | OperatorFunction<T, R>
selector | Optional. Default is Optional selector function which can use the multicasted source sequence as many times as needed, without causing multiple subscriptions to the source sequence. Subscribers to the given source will receive all notifications of the source from the time of the subscription on. |
MonoTypeOperatorFunction<T> | OperatorFunction<T, R>
: A ConnectableObservable that upon connection causes the source Observable to emit items to its Observers.
Makes a cold Observable hot
Make source$ hot by applying publish operator, then merge each inner observable into a single one and subscribe.
import { of, zip, interval, merge } from "rxjs"; import { map, publish, tap } from "rxjs/operators"; const source$ = zip(interval(2000), of(1, 2, 3, 4, 5, 6, 7, 8, 9)).pipe( map(values => values[1]) ); source$ .pipe( publish(multicasted$ => merge( multicasted$.pipe(tap(x => console.log('Stream 1:', x))), multicasted$.pipe(tap(x => console.log('Stream 2:', x))), multicasted$.pipe(tap(x => console.log('Stream 3:', x))), ) ) ) .subscribe(); // Results every two seconds // Stream 1: 1 // Stream 2: 1 // Stream 3: 1 // ... // Stream 1: 9 // Stream 2: 9 // Stream 3: 9
publish(): UnaryFunction<Observable<T>, ConnectableObservable<T>>
There are no parameters.
UnaryFunction<Observable<T>, ConnectableObservable<T>>
publish(selector: (shared: Observable<T>) => O): OperatorFunction<T, ObservedValueOf<O>>
selector | Type: |
OperatorFunction<T, ObservedValueOf<O>>
publish(selector: MonoTypeOperatorFunction<T>): MonoTypeOperatorFunction<T>
selector | Type: |
MonoTypeOperatorFunction<T>
© 2015–2018 Google, Inc., Netflix, Inc., Microsoft Corp. and contributors.
Code licensed under an Apache-2.0 License. Documentation licensed under CC BY 4.0.
https://rxjs.dev/api/operators/publish