68 lines
2.6 KiB
TypeScript
Executable File
68 lines
2.6 KiB
TypeScript
Executable File
import { Operator } from '../Operator';
|
|
import { Observable } from '../Observable';
|
|
import { Subscriber } from '../Subscriber';
|
|
import { Subscription } from '../Subscription';
|
|
import { OuterSubscriber } from '../OuterSubscriber';
|
|
import { InnerSubscriber } from '../InnerSubscriber';
|
|
import { OperatorFunction } from '../interfaces';
|
|
/**
|
|
* 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 <caption>Count the number of click events</caption>
|
|
* const click$ = Rx.Observable.fromEvent(document, 'click');
|
|
* const one$ = click$.mapTo(1);
|
|
* const seed = 0;
|
|
* const count$ = one$.mergeScan((acc, one) => Rx.Observable.of(acc + one), seed);
|
|
* count$.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) => Observable<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) => Observable<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 OuterSubscriber<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) => Observable<R>, acc: R, concurrent: number);
|
|
protected _next(value: any): void;
|
|
private _innerSub(ish, value, index);
|
|
protected _complete(): void;
|
|
notifyNext(outerValue: T, innerValue: R, outerIndex: number, innerIndex: number, innerSub: InnerSubscriber<T, R>): void;
|
|
notifyComplete(innerSub: Subscription): void;
|
|
}
|