45 lines
1.5 KiB
JavaScript
45 lines
1.5 KiB
JavaScript
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"use strict";
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var __extends = (this && this.__extends) || function (d, b) {
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for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
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function __() { this.constructor = d; }
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d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
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};
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var Subscriber_1 = require('../Subscriber');
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/**
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* If the source Observable is empty it returns an Observable that emits true, otherwise it emits false.
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*
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* <img src="./img/isEmpty.png" width="100%">
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*
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* @returns {Observable} an Observable that emits a Boolean.
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*/
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function isEmpty() {
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return this.lift(new IsEmptyOperator());
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}
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exports.isEmpty = isEmpty;
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var IsEmptyOperator = (function () {
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function IsEmptyOperator() {
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}
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IsEmptyOperator.prototype.call = function (observer) {
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return new IsEmptySubscriber(observer);
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};
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return IsEmptyOperator;
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}());
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var IsEmptySubscriber = (function (_super) {
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__extends(IsEmptySubscriber, _super);
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function IsEmptySubscriber(destination) {
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_super.call(this, destination);
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}
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IsEmptySubscriber.prototype.notifyComplete = function (isEmpty) {
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var destination = this.destination;
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destination.next(isEmpty);
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destination.complete();
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};
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IsEmptySubscriber.prototype._next = function (value) {
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this.notifyComplete(false);
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};
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IsEmptySubscriber.prototype._complete = function () {
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this.notifyComplete(true);
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};
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return IsEmptySubscriber;
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}(Subscriber_1.Subscriber));
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//# sourceMappingURL=isEmpty.js.map
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