63 lines
2.2 KiB
JavaScript
63 lines
2.2 KiB
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 Subscriber_1 = require('../Subscriber');
|
|
/**
|
|
* Emits the given constant value on the output Observable every time the source
|
|
* Observable emits a value.
|
|
*
|
|
* <span class="informal">Like {@link map}, but it maps every source value to
|
|
* the same output value every time.</span>
|
|
*
|
|
* <img src="./img/mapTo.png" width="100%">
|
|
*
|
|
* Takes a constant `value` as argument, and emits that whenever the source
|
|
* Observable emits a value. In other words, ignores the actual source value,
|
|
* and simply uses the emission moment to know when to emit the given `value`.
|
|
*
|
|
* @example <caption>Map every click to the string 'Hi'</caption>
|
|
* var clicks = Rx.Observable.fromEvent(document, 'click');
|
|
* var greetings = clicks.mapTo('Hi');
|
|
* greetings.subscribe(x => console.log(x));
|
|
*
|
|
* @see {@link map}
|
|
*
|
|
* @param {any} value The value to map each source value to.
|
|
* @return {Observable} An Observable that emits the given `value` every time
|
|
* the source Observable emits something.
|
|
* @method mapTo
|
|
* @owner Observable
|
|
*/
|
|
function mapTo(value) {
|
|
return function (source) { return source.lift(new MapToOperator(value)); };
|
|
}
|
|
exports.mapTo = mapTo;
|
|
var MapToOperator = (function () {
|
|
function MapToOperator(value) {
|
|
this.value = value;
|
|
}
|
|
MapToOperator.prototype.call = function (subscriber, source) {
|
|
return source.subscribe(new MapToSubscriber(subscriber, this.value));
|
|
};
|
|
return MapToOperator;
|
|
}());
|
|
/**
|
|
* We need this JSDoc comment for affecting ESDoc.
|
|
* @ignore
|
|
* @extends {Ignored}
|
|
*/
|
|
var MapToSubscriber = (function (_super) {
|
|
__extends(MapToSubscriber, _super);
|
|
function MapToSubscriber(destination, value) {
|
|
_super.call(this, destination);
|
|
this.value = value;
|
|
}
|
|
MapToSubscriber.prototype._next = function (x) {
|
|
this.destination.next(this.value);
|
|
};
|
|
return MapToSubscriber;
|
|
}(Subscriber_1.Subscriber));
|
|
//# sourceMappingURL=mapTo.js.map
|