@reactivex/rxjs
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Reactive Extensions for modern JavaScript
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<div class="content" data-ice="content"><h1 data-ice="title">es6/operator/mapTo.js</h1>
<pre class="source-code line-number raw-source-code"><code class="prettyprint linenums" data-ice="content">import { Subscriber } from '../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 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
*/
export function mapTo(value) {
return this.lift(new MapToOperator(value));
}
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));
//# sourceMappingURL=mapTo.js.map</code></pre>
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