work.suroh.tk/node_modules/rxjs/_esm2015/operator/debounce.js

47 lines
2.2 KiB
JavaScript

import { debounce as higherOrder } from '../operators/debounce';
/**
* Emits a value from the source Observable only after a particular time span
* determined by another Observable has passed without another source emission.
*
* <span class="informal">It's like {@link debounceTime}, but the time span of
* emission silence is determined by a second Observable.</span>
*
* <img src="./img/debounce.png" width="100%">
*
* `debounce` delays values emitted by the source Observable, but drops previous
* pending delayed emissions if a new value arrives on the source Observable.
* This operator keeps track of the most recent value from the source
* Observable, and spawns a duration Observable by calling the
* `durationSelector` function. The value is emitted only when the duration
* Observable emits a value or completes, and if no other value was emitted on
* the source Observable since the duration Observable was spawned. If a new
* value appears before the duration Observable emits, the previous value will
* be dropped and will not be emitted on the output Observable.
*
* Like {@link debounceTime}, this is a rate-limiting operator, and also a
* delay-like operator since output emissions do not necessarily occur at the
* same time as they did on the source Observable.
*
* @example <caption>Emit the most recent click after a burst of clicks</caption>
* var clicks = Rx.Observable.fromEvent(document, 'click');
* var result = clicks.debounce(() => Rx.Observable.interval(1000));
* result.subscribe(x => console.log(x));
*
* @see {@link audit}
* @see {@link debounceTime}
* @see {@link delayWhen}
* @see {@link throttle}
*
* @param {function(value: T): SubscribableOrPromise} durationSelector A function
* that receives a value from the source Observable, for computing the timeout
* duration for each source value, returned as an Observable or a Promise.
* @return {Observable} An Observable that delays the emissions of the source
* Observable by the specified duration Observable returned by
* `durationSelector`, and may drop some values if they occur too frequently.
* @method debounce
* @owner Observable
*/
export function debounce(durationSelector) {
return higherOrder(durationSelector)(this);
}
//# sourceMappingURL=debounce.js.map