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