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33 lines
1.3 KiB
33 lines
1.3 KiB
import { Observable } from '../Observable'; |
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/** |
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* Applies an accumulator function over the source Observable where the |
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* accumulator function itself returns an Observable, then each intermediate |
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* Observable returned is merged into the output Observable. |
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* |
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* <span class="informal">It's like {@link scan}, but the Observables returned |
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* by the accumulator are merged into the outer Observable.</span> |
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* |
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* @example <caption>Count the number of click events</caption> |
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* const click$ = Rx.Observable.fromEvent(document, 'click'); |
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* const one$ = click$.mapTo(1); |
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* const seed = 0; |
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* const count$ = one$.mergeScan((acc, one) => Rx.Observable.of(acc + one), seed); |
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* count$.subscribe(x => console.log(x)); |
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* |
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* // Results: |
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* 1 |
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* 2 |
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* 3 |
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* 4 |
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* // ...and so on for each click |
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* |
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* @param {function(acc: R, value: T): Observable<R>} accumulator |
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* The accumulator function called on each source value. |
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* @param seed The initial accumulation value. |
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* @param {number} [concurrent=Number.POSITIVE_INFINITY] Maximum number of |
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* input Observables being subscribed to concurrently. |
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* @return {Observable<R>} An observable of the accumulated values. |
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* @method mergeScan |
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* @owner Observable |
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*/ |
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export declare function mergeScan<T, R>(this: Observable<T>, accumulator: (acc: R, value: T) => Observable<R>, seed: R, concurrent?: number): Observable<R>;
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