@reactivex/rxjs/dist/es6/operator/debounce.js

Reactive Extensions for modern JavaScript

import { OuterSubscriber } from '../OuterSubscriber';
import { subscribeToResult } from '../util/subscribeToResult';
/**
 * Returns the source Observable delayed by the computed debounce duration,
 * with the duration lengthened if a new source item arrives before the delay
 * duration ends.
 * In practice, for each item emitted on the source, this operator holds the
 * latest item, waits for a silence as long as the `durationSelector` specifies,
 * and only then emits the latest source item on the result Observable.
 * @param {function} durationSelector function for computing the timeout duration for each item.
 * @return {Observable} an Observable the same as source Observable, but drops items.
 * @method debounce
 * @owner Observable
 */
export function debounce(durationSelector) {
    return this.lift(new DebounceOperator(durationSelector));
}
class DebounceOperator {
    constructor(durationSelector) {
        this.durationSelector = durationSelector;
    }
    call(subscriber, source) {
        return source._subscribe(new DebounceSubscriber(subscriber, this.durationSelector));
    }
}
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
class DebounceSubscriber extends OuterSubscriber {
    constructor(destination, durationSelector) {
        super(destination);
        this.durationSelector = durationSelector;
        this.hasValue = false;
        this.durationSubscription = null;
    }
    _next(value) {
        try {
            const result = this.durationSelector.call(this, value);
            if (result) {
                this._tryNext(value, result);
            }
        }
        catch (err) {
            this.destination.error(err);
        }
    }
    _complete() {
        this.emitValue();
        this.destination.complete();
    }
    _tryNext(value, duration) {
        let subscription = this.durationSubscription;
        this.value = value;
        this.hasValue = true;
        if (subscription) {
            subscription.unsubscribe();
            this.remove(subscription);
        }
        subscription = subscribeToResult(this, duration);
        if (!subscription.isUnsubscribed) {
            this.add(this.durationSubscription = subscription);
        }
    }
    notifyNext(outerValue, innerValue, outerIndex, innerIndex, innerSub) {
        this.emitValue();
    }
    notifyComplete() {
        this.emitValue();
    }
    emitValue() {
        if (this.hasValue) {
            const value = this.value;
            const subscription = this.durationSubscription;
            if (subscription) {
                this.durationSubscription = null;
                subscription.unsubscribe();
                this.remove(subscription);
            }
            this.value = null;
            this.hasValue = false;
            super._next(value);
        }
    }
}
//# sourceMappingURL=debounce.js.map