isEmpty.js
1.64 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
"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 Subscriber_1 = require('../Subscriber');
/**
* If the source Observable is empty it returns an Observable that emits true, otherwise it emits false.
*
* <img src="./img/isEmpty.png" width="100%">
*
* @return {Observable} an Observable that emits a Boolean.
* @method isEmpty
* @owner Observable
*/
function isEmpty() {
return this.lift(new IsEmptyOperator());
}
exports.isEmpty = isEmpty;
var IsEmptyOperator = (function () {
function IsEmptyOperator() {
}
IsEmptyOperator.prototype.call = function (observer, source) {
return source.subscribe(new IsEmptySubscriber(observer));
};
return IsEmptyOperator;
}());
/**
* We need this JSDoc comment for affecting ESDoc.
* @ignore
* @extends {Ignored}
*/
var IsEmptySubscriber = (function (_super) {
__extends(IsEmptySubscriber, _super);
function IsEmptySubscriber(destination) {
_super.call(this, destination);
}
IsEmptySubscriber.prototype.notifyComplete = function (isEmpty) {
var destination = this.destination;
destination.next(isEmpty);
destination.complete();
};
IsEmptySubscriber.prototype._next = function (value) {
this.notifyComplete(false);
};
IsEmptySubscriber.prototype._complete = function () {
this.notifyComplete(true);
};
return IsEmptySubscriber;
}(Subscriber_1.Subscriber));
//# sourceMappingURL=isEmpty.js.map