73 lines
2.6 KiB
TypeScript
73 lines
2.6 KiB
TypeScript
import { Operator } from '../Operator';
|
|
import { Subscriber } from '../Subscriber';
|
|
import { ObservableInput, OperatorFunction } from '../types';
|
|
import { SimpleOuterSubscriber } from '../innerSubscribe';
|
|
/**
|
|
* Applies an accumulator function over the source Observable where the
|
|
* accumulator function itself returns an Observable, then each intermediate
|
|
* Observable returned is merged into the output Observable.
|
|
*
|
|
* <span class="informal">It's like {@link scan}, but the Observables returned
|
|
* by the accumulator are merged into the outer Observable.</span>
|
|
*
|
|
* ## Example
|
|
* Count the number of click events
|
|
* ```ts
|
|
* import { fromEvent, of } from 'rxjs';
|
|
* import { mapTo, mergeScan } from 'rxjs/operators';
|
|
*
|
|
* const click$ = fromEvent(document, 'click');
|
|
* const one$ = click$.pipe(mapTo(1));
|
|
* const seed = 0;
|
|
* const count$ = one$.pipe(
|
|
* mergeScan((acc, one) => of(acc + one), seed),
|
|
* );
|
|
* count$.subscribe(x => console.log(x));
|
|
*
|
|
* // Results:
|
|
* // 1
|
|
* // 2
|
|
* // 3
|
|
* // 4
|
|
* // ...and so on for each click
|
|
* ```
|
|
*
|
|
* @param {function(acc: R, value: T): Observable<R>} accumulator
|
|
* The accumulator function called on each source value.
|
|
* @param seed The initial accumulation value.
|
|
* @param {number} [concurrent=Number.POSITIVE_INFINITY] Maximum number of
|
|
* input Observables being subscribed to concurrently.
|
|
* @return {Observable<R>} An observable of the accumulated values.
|
|
* @method mergeScan
|
|
* @owner Observable
|
|
*/
|
|
export declare function mergeScan<T, R>(accumulator: (acc: R, value: T, index: number) => ObservableInput<R>, seed: R, concurrent?: number): OperatorFunction<T, R>;
|
|
export declare class MergeScanOperator<T, R> implements Operator<T, R> {
|
|
private accumulator;
|
|
private seed;
|
|
private concurrent;
|
|
constructor(accumulator: (acc: R, value: T, index: number) => ObservableInput<R>, seed: R, concurrent: number);
|
|
call(subscriber: Subscriber<R>, source: any): any;
|
|
}
|
|
/**
|
|
* We need this JSDoc comment for affecting ESDoc.
|
|
* @ignore
|
|
* @extends {Ignored}
|
|
*/
|
|
export declare class MergeScanSubscriber<T, R> extends SimpleOuterSubscriber<T, R> {
|
|
private accumulator;
|
|
private acc;
|
|
private concurrent;
|
|
private hasValue;
|
|
private hasCompleted;
|
|
private buffer;
|
|
private active;
|
|
protected index: number;
|
|
constructor(destination: Subscriber<R>, accumulator: (acc: R, value: T, index: number) => ObservableInput<R>, acc: R, concurrent: number);
|
|
protected _next(value: any): void;
|
|
private _innerSub;
|
|
protected _complete(): void;
|
|
notifyNext(innerValue: R): void;
|
|
notifyComplete(): void;
|
|
}
|