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52 lines
2.3 KiB
52 lines
2.3 KiB
2 years ago
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import { Observable } from '../Observable';
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import { OperatorFunction } from '../interfaces';
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/**
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* Branch out the source Observable values as a nested Observable with each
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* nested Observable emitting at most `windowSize` values.
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*
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* <span class="informal">It's like {@link bufferCount}, but emits a nested
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* Observable instead of an array.</span>
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*
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* <img src="./img/windowCount.png" width="100%">
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*
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* Returns an Observable that emits windows of items it collects from the source
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* Observable. The output Observable emits windows every `startWindowEvery`
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* items, each containing no more than `windowSize` items. When the source
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* Observable completes or encounters an error, the output Observable emits
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* the current window and propagates the notification from the source
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* Observable. If `startWindowEvery` is not provided, then new windows are
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* started immediately at the start of the source and when each window completes
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* with size `windowSize`.
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*
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* @example <caption>Ignore every 3rd click event, starting from the first one</caption>
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* var clicks = Rx.Observable.fromEvent(document, 'click');
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* var result = clicks.windowCount(3)
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* .map(win => win.skip(1)) // skip first of every 3 clicks
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* .mergeAll(); // flatten the Observable-of-Observables
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* result.subscribe(x => console.log(x));
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*
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* @example <caption>Ignore every 3rd click event, starting from the third one</caption>
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* var clicks = Rx.Observable.fromEvent(document, 'click');
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* var result = clicks.windowCount(2, 3)
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* .mergeAll(); // flatten the Observable-of-Observables
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* result.subscribe(x => console.log(x));
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*
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* @see {@link window}
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* @see {@link windowTime}
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* @see {@link windowToggle}
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* @see {@link windowWhen}
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* @see {@link bufferCount}
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*
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* @param {number} windowSize The maximum number of values emitted by each
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* window.
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* @param {number} [startWindowEvery] Interval at which to start a new window.
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* For example if `startWindowEvery` is `2`, then a new window will be started
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* on every other value from the source. A new window is started at the
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* beginning of the source by default.
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* @return {Observable<Observable<T>>} An Observable of windows, which in turn
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* are Observable of values.
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* @method windowCount
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* @owner Observable
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*/
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export declare function windowCount<T>(windowSize: number, startWindowEvery?: number): OperatorFunction<T, Observable<T>>;
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