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

Reactive Extensions for modern JavaScript

"use strict";
var __extends = (this && this.__extends) || function (d, b) {
    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
    function __() { this.constructor = d; }
    d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
var OuterSubscriber_1 = require('../OuterSubscriber');
var subscribeToResult_1 = require('../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
 */
function sample(notifier) {
    return this.lift(new SampleOperator(notifier));
}
exports.sample = sample;
var SampleOperator = (function () {
    function SampleOperator(notifier) {
        this.notifier = notifier;
    }
    SampleOperator.prototype.call = function (subscriber, source) {
        return source._subscribe(new SampleSubscriber(subscriber, this.notifier));
    };
    return SampleOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var SampleSubscriber = (function (_super) {
    __extends(SampleSubscriber, _super);
    function SampleSubscriber(destination, notifier) {
        _super.call(this, destination);
        this.hasValue = false;
        this.add(subscribeToResult_1.subscribeToResult(this, notifier));
    }
    SampleSubscriber.prototype._next = function (value) {
        this.value = value;
        this.hasValue = true;
    };
    SampleSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {
        this.emitValue();
    };
    SampleSubscriber.prototype.notifyComplete = function () {
        this.emitValue();
    };
    SampleSubscriber.prototype.emitValue = function () {
        if (this.hasValue) {
            this.hasValue = false;
            this.destination.next(this.value);
        }
    };
    return SampleSubscriber;
}(OuterSubscriber_1.OuterSubscriber));
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