@reactivex/rxjs
Version:
Reactive Extensions for modern JavaScript
79 lines • 2.73 kB
JavaScript
;
var __extends = (this && this.__extends) || (function () {
var extendStatics = function (d, b) {
extendStatics = Object.setPrototypeOf ||
({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
return extendStatics(d, b);
}
return function (d, b) {
extendStatics(d, b);
function __() { this.constructor = d; }
d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
})();
Object.defineProperty(exports, "__esModule", { value: true });
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>
*
* 
*
* 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
* Map every click to the string 'Hi'
* ```ts
* import { fromEvent } from 'rxjs';
* import { mapTo } from 'rxjs/operators';
*
* const clicks = fromEvent(document, 'click');
* const greetings = clicks.pipe(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 = /** @class */ (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 = /** @class */ (function (_super) {
__extends(MapToSubscriber, _super);
function MapToSubscriber(destination, value) {
var _this = _super.call(this, destination) || this;
_this.value = value;
return _this;
}
MapToSubscriber.prototype._next = function (x) {
this.destination.next(this.value);
};
return MapToSubscriber;
}(Subscriber_1.Subscriber));
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