@reactivex/rxjs
Version:
Reactive Extensions for modern JavaScript
97 lines • 3.7 kB
JavaScript
;
var __extends = (this && this.__extends) || (function () {
var extendStatics = function (d, b) {
extendStatics = Object.setPrototypeOf ||
({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
return extendStatics(d, b);
}
return function (d, b) {
extendStatics(d, b);
function __() { this.constructor = d; }
d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
})();
Object.defineProperty(exports, "__esModule", { value: true });
var innerSubscribe_1 = require("../innerSubscribe");
/**
* Emits the values emitted by the source Observable until a `notifier`
* Observable emits a value.
*
* <span class="informal">Lets values pass until a second Observable,
* `notifier`, emits a value. Then, it completes.</span>
*
* 
*
* `takeUntil` subscribes and begins mirroring the source Observable. It also
* monitors a second Observable, `notifier` that you provide. If the `notifier`
* emits a value, the output Observable stops mirroring the source Observable
* and completes. If the `notifier` doesn't emit any value and completes
* then `takeUntil` will pass all values.
*
* ## Example
* Tick every second until the first click happens
* ```ts
* import { fromEvent, interval } from 'rxjs';
* import { takeUntil } from 'rxjs/operators';
*
* const source = interval(1000);
* const clicks = fromEvent(document, 'click');
* const result = source.pipe(takeUntil(clicks));
* result.subscribe(x => console.log(x));
* ```
*
* @see {@link take}
* @see {@link takeLast}
* @see {@link takeWhile}
* @see {@link skip}
*
* @param {Observable} notifier The Observable whose first emitted value will
* cause the output Observable of `takeUntil` to stop emitting values from the
* source Observable.
* @return {Observable<T>} An Observable that emits the values from the source
* Observable until such time as `notifier` emits its first value.
* @method takeUntil
* @owner Observable
*/
function takeUntil(notifier) {
return function (source) { return source.lift(new TakeUntilOperator(notifier)); };
}
exports.takeUntil = takeUntil;
var TakeUntilOperator = /** @class */ (function () {
function TakeUntilOperator(notifier) {
this.notifier = notifier;
}
TakeUntilOperator.prototype.call = function (subscriber, source) {
var takeUntilSubscriber = new TakeUntilSubscriber(subscriber);
var notifierSubscription = innerSubscribe_1.innerSubscribe(this.notifier, new innerSubscribe_1.SimpleInnerSubscriber(takeUntilSubscriber));
if (notifierSubscription && !takeUntilSubscriber.seenValue) {
takeUntilSubscriber.add(notifierSubscription);
return source.subscribe(takeUntilSubscriber);
}
return takeUntilSubscriber;
};
return TakeUntilOperator;
}());
/**
* We need this JSDoc comment for affecting ESDoc.
* @ignore
* @extends {Ignored}
*/
var TakeUntilSubscriber = /** @class */ (function (_super) {
__extends(TakeUntilSubscriber, _super);
function TakeUntilSubscriber(destination) {
var _this = _super.call(this, destination) || this;
_this.seenValue = false;
return _this;
}
TakeUntilSubscriber.prototype.notifyNext = function () {
this.seenValue = true;
this.complete();
};
TakeUntilSubscriber.prototype.notifyComplete = function () {
// noop
};
return TakeUntilSubscriber;
}(innerSubscribe_1.SimpleOuterSubscriber));
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