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node_modules/rxjs/operators/sample.js

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+"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');
+/**
+ * Emits the most recently emitted value from the source Observable whenever
+ * another Observable, the `notifier`, emits.
+ *
+ * <span class="informal">It's like {@link sampleTime}, but samples whenever
+ * the `notifier` Observable emits something.</span>
+ *
+ * <img src="./img/sample.png" width="100%">
+ *
+ * Whenever the `notifier` Observable emits a value or completes, `sample`
+ * looks at the source Observable and emits whichever value it has most recently
+ * emitted since the previous sampling, unless the source has not emitted
+ * anything since the previous sampling. The `notifier` is subscribed to as soon
+ * as the output Observable is subscribed.
+ *
+ * @example <caption>On every click, sample the most recent "seconds" timer</caption>
+ * var seconds = Rx.Observable.interval(1000);
+ * var clicks = Rx.Observable.fromEvent(document, 'click');
+ * var result = seconds.sample(clicks);
+ * result.subscribe(x => console.log(x));
+ *
+ * @see {@link audit}
+ * @see {@link debounce}
+ * @see {@link sampleTime}
+ * @see {@link throttle}
+ *
+ * @param {Observable<any>} notifier The Observable to use for sampling the
+ * source Observable.
+ * @return {Observable<T>} An Observable that emits the results of sampling the
+ * values emitted by the source Observable whenever the notifier Observable
+ * emits value or completes.
+ * @method sample
+ * @owner Observable
+ */
+function sample(notifier) {
+    return function (source) { return source.lift(new SampleOperator(notifier)); };
+}
+exports.sample = sample;
+var SampleOperator = (function () {
+    function SampleOperator(notifier) {
+        this.notifier = notifier;
+    }
+    SampleOperator.prototype.call = function (subscriber, source) {
+        var sampleSubscriber = new SampleSubscriber(subscriber);
+        var subscription = source.subscribe(sampleSubscriber);
+        subscription.add(subscribeToResult_1.subscribeToResult(sampleSubscriber, this.notifier));
+        return subscription;
+    };
+    return SampleOperator;
+}());
+/**
+ * We need this JSDoc comment for affecting ESDoc.
+ * @ignore
+ * @extends {Ignored}
+ */
+var SampleSubscriber = (function (_super) {
+    __extends(SampleSubscriber, _super);
+    function SampleSubscriber() {
+        _super.apply(this, arguments);
+        this.hasValue = false;
+    }
+    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));
+//# sourceMappingURL=sample.js.map