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61 lines
2.3 KiB
TypeScript
61 lines
2.3 KiB
TypeScript
import { OperatorFunction, ObservableInput } from '../types';
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/**
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* Converts a higher-order Observable into a first-order Observable which
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* concurrently delivers all values that are emitted on the inner Observables.
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*
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* <span class="informal">Flattens an Observable-of-Observables.</span>
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*
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* 
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*
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* `mergeAll` subscribes to an Observable that emits Observables, also known as
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* a higher-order Observable. Each time it observes one of these emitted inner
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* Observables, it subscribes to that and delivers all the values from the
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* inner Observable on the output Observable. The output Observable only
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* completes once all inner Observables have completed. Any error delivered by
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* a inner Observable will be immediately emitted on the output Observable.
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*
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* ## Examples
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* Spawn a new interval Observable for each click event, and blend their outputs as one Observable
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* ```ts
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* import { fromEvent, interval } from 'rxjs';
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* import { map, mergeAll } from 'rxjs/operators';
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*
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* const clicks = fromEvent(document, 'click');
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* const higherOrder = clicks.pipe(map((ev) => interval(1000)));
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* const firstOrder = higherOrder.pipe(mergeAll());
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* firstOrder.subscribe(x => console.log(x));
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* ```
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*
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* Count from 0 to 9 every second for each click, but only allow 2 concurrent timers
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* ```ts
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* import { fromEvent, interval } from 'rxjs';
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* import { take, map, mergeAll } from 'rxjs/operators';
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*
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* const clicks = fromEvent(document, 'click');
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* const higherOrder = clicks.pipe(
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* map((ev) => interval(1000).pipe(take(10))),
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* );
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* const firstOrder = higherOrder.pipe(mergeAll(2));
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* firstOrder.subscribe(x => console.log(x));
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* ```
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*
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* @see {@link combineAll}
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* @see {@link concatAll}
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* @see {@link exhaust}
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* @see {@link merge}
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* @see {@link mergeMap}
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* @see {@link mergeMapTo}
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* @see {@link mergeScan}
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* @see {@link switchAll}
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* @see {@link switchMap}
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* @see {@link zipAll}
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*
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* @param {number} [concurrent=Number.POSITIVE_INFINITY] Maximum number of inner
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* Observables being subscribed to concurrently.
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* @return {Observable} An Observable that emits values coming from all the
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* inner Observables emitted by the source Observable.
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* @method mergeAll
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* @owner Observable
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*/
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export declare function mergeAll<T>(concurrent?: number): OperatorFunction<ObservableInput<T>, T>;
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