39 lines
1.5 KiB
JavaScript
39 lines
1.5 KiB
JavaScript
"use strict";
|
|
var mergeScan_1 = require('../operators/mergeScan');
|
|
/**
|
|
* 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
|
|
*/
|
|
function mergeScan(accumulator, seed, concurrent) {
|
|
if (concurrent === void 0) { concurrent = Number.POSITIVE_INFINITY; }
|
|
return mergeScan_1.mergeScan(accumulator, seed, concurrent)(this);
|
|
}
|
|
exports.mergeScan = mergeScan;
|
|
//# sourceMappingURL=mergeScan.js.map
|