@reactivex/rxjs
Version:
Reactive Extensions for modern JavaScript
56 lines • 2.08 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
var mergeMap_1 = require("./mergeMap");
/* tslint:enable:max-line-length */
/**
* Projects each source value to the same Observable which is merged multiple
* times in the output Observable.
*
* <span class="informal">It's like {@link mergeMap}, but maps each value always
* to the same inner Observable.</span>
*
* 
*
* Maps each source value to the given Observable `innerObservable` regardless
* of the source value, and then merges those resulting Observables into one
* single Observable, which is the output Observable.
*
* ## Example
* For each click event, start an interval Observable ticking every 1 second
* ```ts
* import { fromEvent, interval } from 'rxjs';
* import { mergeMapTo } from 'rxjs/operators';
*
* const clicks = fromEvent(document, 'click');
* const result = clicks.pipe(mergeMapTo(interval(1000)));
* result.subscribe(x => console.log(x));
* ```
*
* @see {@link concatMapTo}
* @see {@link merge}
* @see {@link mergeAll}
* @see {@link mergeMap}
* @see {@link mergeScan}
* @see {@link switchMapTo}
*
* @param {ObservableInput} innerObservable An Observable to replace each value from
* the source Observable.
* @param {number} [concurrent=Number.POSITIVE_INFINITY] Maximum number of input
* Observables being subscribed to concurrently.
* @return {Observable} An Observable that emits items from the given
* `innerObservable`
* @method mergeMapTo
* @owner Observable
*/
function mergeMapTo(innerObservable, resultSelector, concurrent) {
if (concurrent === void 0) { concurrent = Number.POSITIVE_INFINITY; }
if (typeof resultSelector === 'function') {
return mergeMap_1.mergeMap(function () { return innerObservable; }, resultSelector, concurrent);
}
if (typeof resultSelector === 'number') {
concurrent = resultSelector;
}
return mergeMap_1.mergeMap(function () { return innerObservable; }, concurrent);
}
exports.mergeMapTo = mergeMapTo;
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