40 lines
1.7 KiB
TypeScript
40 lines
1.7 KiB
TypeScript
|
import { IScheduler } from '../Scheduler';
|
||
|
|
import { MonoTypeOperatorFunction } from '../interfaces';
|
||
|
|
/**
|
||
|
|
* 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 IScheduler} 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 declare function sampleTime<T>(period: number, scheduler?: IScheduler): MonoTypeOperatorFunction<T>;
|