@reactivex/rxjs

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<pre class="source-code line-number raw-source-code"><code class="prettyprint linenums" data-ice="content">import { Subscriber } from '../Subscriber'; import { async } from '../scheduler/async'; /** * Emits the most recently emitted value from the source Observable within * periodic time intervals. * * <span class="informal">Samples the source Observable at periodic time * intervals, emitting what it samples.</span> * * <img src="./img/sampleTime.png" width="100%"> * * `sampleTime` periodically looks at the source Observable and emits whichever * value it has most recently emitted since the previous sampling, unless the * source has not emitted anything since the previous sampling. The sampling * happens periodically in time every `period` milliseconds (or the time unit * defined by the optional `scheduler` argument). The sampling starts as soon as * the output Observable is subscribed. * * @example <caption>Every second, emit the most recent click at most once</caption> * var clicks = Rx.Observable.fromEvent(document, 'click'); * var result = clicks.sampleTime(1000); * result.subscribe(x => console.log(x)); * * @see {@link auditTime} * @see {@link debounceTime} * @see {@link delay} * @see {@link sample} * @see {@link throttleTime} * * @param {number} period The sampling period expressed in milliseconds or the * time unit determined internally by the optional `scheduler`. * @param {Scheduler} [scheduler=async] The {@link Scheduler} to use for * managing the timers that handle the sampling. * @return {Observable<T>} An Observable that emits the results of sampling the * values emitted by the source Observable at the specified time interval. * @method sampleTime * @owner Observable */ export function sampleTime(period, scheduler) { if (scheduler === void 0) { scheduler = async; } return this.lift(new SampleTimeOperator(period, scheduler)); } var SampleTimeOperator = (function () { function SampleTimeOperator(period, scheduler) { this.period = period; this.scheduler = scheduler; } SampleTimeOperator.prototype.call = function (subscriber, source) { return source._subscribe(new SampleTimeSubscriber(subscriber, this.period, this.scheduler)); }; return SampleTimeOperator; }()); /** * We need this JSDoc comment for affecting ESDoc. * @ignore * @extends {Ignored} */ var SampleTimeSubscriber = (function (_super) { __extends(SampleTimeSubscriber, _super); function SampleTimeSubscriber(destination, period, scheduler) { _super.call(this, destination); this.period = period; this.scheduler = scheduler; this.hasValue = false; this.add(scheduler.schedule(dispatchNotification, period, { subscriber: this, period: period })); } SampleTimeSubscriber.prototype._next = function (value) { this.lastValue = value; this.hasValue = true; }; SampleTimeSubscriber.prototype.notifyNext = function () { if (this.hasValue) { this.hasValue = false; this.destination.next(this.lastValue); } }; return SampleTimeSubscriber; }(Subscriber)); function dispatchNotification(state) { var subscriber = state.subscriber, period = state.period; subscriber.notifyNext(); this.schedule(state, period); } //# sourceMappingURL=sampleTime.js.map</code></pre> </div> <footer class="footer"> Generated by <a href="https://esdoc.org">ESDoc<span data-ice="esdocVersion">(0.4.8)</span></a> </footer> <script src="script/search_index.js"></script> <script src="script/search.js"></script> <script src="script/pretty-print.js"></script> <script src="script/inherited-summary.js"></script> <script src="script/test-summary.js"></script> <script src="script/inner-link.js"></script> <script src="script/patch-for-local.js"></script> </body> </html>