Opal-Estate-Pro/node_modules/rxjs/operators/mergeAll.js
2019-09-13 11:27:52 +07:00

53 lines
2.3 KiB
JavaScript
Executable File

"use strict";
var mergeMap_1 = require('./mergeMap');
var identity_1 = require('../util/identity');
/**
* Converts a higher-order Observable into a first-order Observable which
* concurrently delivers all values that are emitted on the inner Observables.
*
* <span class="informal">Flattens an Observable-of-Observables.</span>
*
* <img src="./img/mergeAll.png" width="100%">
*
* `mergeAll` subscribes to an Observable that emits Observables, also known as
* a higher-order Observable. Each time it observes one of these emitted inner
* Observables, it subscribes to that and delivers all the values from the
* inner Observable on the output Observable. The output Observable only
* completes once all inner Observables have completed. Any error delivered by
* a inner Observable will be immediately emitted on the output Observable.
*
* @example <caption>Spawn a new interval Observable for each click event, and blend their outputs as one Observable</caption>
* var clicks = Rx.Observable.fromEvent(document, 'click');
* var higherOrder = clicks.map((ev) => Rx.Observable.interval(1000));
* var firstOrder = higherOrder.mergeAll();
* firstOrder.subscribe(x => console.log(x));
*
* @example <caption>Count from 0 to 9 every second for each click, but only allow 2 concurrent timers</caption>
* var clicks = Rx.Observable.fromEvent(document, 'click');
* var higherOrder = clicks.map((ev) => Rx.Observable.interval(1000).take(10));
* var firstOrder = higherOrder.mergeAll(2);
* firstOrder.subscribe(x => console.log(x));
*
* @see {@link combineAll}
* @see {@link concatAll}
* @see {@link exhaust}
* @see {@link merge}
* @see {@link mergeMap}
* @see {@link mergeMapTo}
* @see {@link mergeScan}
* @see {@link switch}
* @see {@link zipAll}
*
* @param {number} [concurrent=Number.POSITIVE_INFINITY] Maximum number of inner
* Observables being subscribed to concurrently.
* @return {Observable} An Observable that emits values coming from all the
* inner Observables emitted by the source Observable.
* @method mergeAll
* @owner Observable
*/
function mergeAll(concurrent) {
if (concurrent === void 0) { concurrent = Number.POSITIVE_INFINITY; }
return mergeMap_1.mergeMap(identity_1.identity, null, concurrent);
}
exports.mergeAll = mergeAll;
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