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68 lines
2.6 KiB
68 lines
2.6 KiB
2 years ago
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import { Operator } from '../Operator';
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import { Observable } from '../Observable';
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import { Subscriber } from '../Subscriber';
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import { Subscription } from '../Subscription';
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import { OuterSubscriber } from '../OuterSubscriber';
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import { InnerSubscriber } from '../InnerSubscriber';
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import { OperatorFunction } from '../interfaces';
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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>(accumulator: (acc: R, value: T) => Observable<R>, seed: R, concurrent?: number): OperatorFunction<T, R>;
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export declare class MergeScanOperator<T, R> implements Operator<T, R> {
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private accumulator;
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private seed;
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private concurrent;
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constructor(accumulator: (acc: R, value: T) => Observable<R>, seed: R, concurrent: number);
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call(subscriber: Subscriber<R>, source: any): any;
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}
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/**
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* We need this JSDoc comment for affecting ESDoc.
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* @ignore
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* @extends {Ignored}
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*/
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export declare class MergeScanSubscriber<T, R> extends OuterSubscriber<T, R> {
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private accumulator;
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private acc;
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private concurrent;
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private hasValue;
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private hasCompleted;
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private buffer;
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private active;
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protected index: number;
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constructor(destination: Subscriber<R>, accumulator: (acc: R, value: T) => Observable<R>, acc: R, concurrent: number);
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protected _next(value: any): void;
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private _innerSub(ish, value, index);
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protected _complete(): void;
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notifyNext(outerValue: T, innerValue: R, outerIndex: number, innerIndex: number, innerSub: InnerSubscriber<T, R>): void;
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notifyComplete(innerSub: Subscription): void;
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}
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