29 lines
1.1 KiB
TypeScript
29 lines
1.1 KiB
TypeScript
|
import { OperatorFunction } from '../interfaces';
|
||
|
|
/**
|
||
|
|
* 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
|
||
|
|
*/
|
||
|
|
export declare function mapTo<T, R>(value: R): OperatorFunction<T, R>;
|