58 lines
2.2 KiB
JavaScript
58 lines
2.2 KiB
JavaScript
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"use strict";
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var __extends = (this && this.__extends) || function (d, b) {
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for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
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function __() { this.constructor = d; }
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d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
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};
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var OuterSubscriber_1 = require('../OuterSubscriber');
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var subscribeToResult_1 = require('../util/subscribeToResult');
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/**
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* Returns an Observable that, when the specified sampler Observable emits an item or completes, it then emits the most
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* recently emitted item (if any) emitted by the source Observable since the previous emission from the sampler
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* Observable.
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*
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* <img src="./img/sample.png" width="100%">
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*
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* @param {Observable} sampler - the Observable to use for sampling the source Observable.
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* @returns {Observable<T>} an Observable that emits the results of sampling the items emitted by this Observable
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* whenever the sampler Observable emits an item or completes.
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*/
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function sample(notifier) {
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return this.lift(new SampleOperator(notifier));
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}
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exports.sample = sample;
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var SampleOperator = (function () {
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function SampleOperator(notifier) {
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this.notifier = notifier;
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}
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SampleOperator.prototype.call = function (subscriber) {
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return new SampleSubscriber(subscriber, this.notifier);
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};
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return SampleOperator;
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}());
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var SampleSubscriber = (function (_super) {
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__extends(SampleSubscriber, _super);
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function SampleSubscriber(destination, notifier) {
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_super.call(this, destination);
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this.hasValue = false;
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this.add(subscribeToResult_1.subscribeToResult(this, notifier));
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}
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SampleSubscriber.prototype._next = function (value) {
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this.value = value;
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this.hasValue = true;
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};
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SampleSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {
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this.emitValue();
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};
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SampleSubscriber.prototype.notifyComplete = function () {
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this.emitValue();
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};
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SampleSubscriber.prototype.emitValue = function () {
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if (this.hasValue) {
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this.hasValue = false;
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this.destination.next(this.value);
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}
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};
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return SampleSubscriber;
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}(OuterSubscriber_1.OuterSubscriber));
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//# sourceMappingURL=sample.js.map
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