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

Reactive Extensions for modern JavaScript

import { OuterSubscriber } from '../OuterSubscriber';
import { subscribeToResult } from '../util/subscribeToResult';
/**
 * Returns an Observable that, when the specified sampler Observable emits an item or completes, it then emits the most
 * recently emitted item (if any) emitted by the source Observable since the previous emission from the sampler
 * Observable.
 *
 * <img src="./img/sample.png" width="100%">
 *
 * @param {Observable} sampler - the Observable to use for sampling the source Observable.
 * @return {Observable<T>} an Observable that emits the results of sampling the items emitted by this Observable
 * whenever the sampler Observable emits an item or completes.
 * @method sample
 * @owner Observable
 */
export function sample(notifier) {
    return this.lift(new SampleOperator(notifier));
}
class SampleOperator {
    constructor(notifier) {
        this.notifier = notifier;
    }
    call(subscriber, source) {
        return source._subscribe(new SampleSubscriber(subscriber, this.notifier));
    }
}
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
class SampleSubscriber extends OuterSubscriber {
    constructor(destination, notifier) {
        super(destination);
        this.hasValue = false;
        this.add(subscribeToResult(this, notifier));
    }
    _next(value) {
        this.value = value;
        this.hasValue = true;
    }
    notifyNext(outerValue, innerValue, outerIndex, innerIndex, innerSub) {
        this.emitValue();
    }
    notifyComplete() {
        this.emitValue();
    }
    emitValue() {
        if (this.hasValue) {
            this.hasValue = false;
            this.destination.next(this.value);
        }
    }
}
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