50 lines
2.3 KiB
JavaScript
50 lines
2.3 KiB
JavaScript
|
"use strict";
|
||
|
|
var switchMapTo_1 = require('../operators/switchMapTo');
|
||
|
|
/* tslint:enable:max-line-length */
|
||
|
|
/**
|
||
|
|
* Projects each source value to the same Observable which is flattened multiple
|
||
|
|
* times with {@link switch} in the output Observable.
|
||
|
|
*
|
||
|
|
* <span class="informal">It's like {@link switchMap}, but maps each value
|
||
|
|
* always to the same inner Observable.</span>
|
||
|
|
*
|
||
|
|
* <img src="./img/switchMapTo.png" width="100%">
|
||
|
|
*
|
||
|
|
* Maps each source value to the given Observable `innerObservable` regardless
|
||
|
|
* of the source value, and then flattens those resulting Observables into one
|
||
|
|
* single Observable, which is the output Observable. The output Observables
|
||
|
|
* emits values only from the most recently emitted instance of
|
||
|
|
* `innerObservable`.
|
||
|
|
*
|
||
|
|
* @example <caption>Rerun an interval Observable on every click event</caption>
|
||
|
|
* var clicks = Rx.Observable.fromEvent(document, 'click');
|
||
|
|
* var result = clicks.switchMapTo(Rx.Observable.interval(1000));
|
||
|
|
* result.subscribe(x => console.log(x));
|
||
|
|
*
|
||
|
|
* @see {@link concatMapTo}
|
||
|
|
* @see {@link switch}
|
||
|
|
* @see {@link switchMap}
|
||
|
|
* @see {@link mergeMapTo}
|
||
|
|
*
|
||
|
|
* @param {ObservableInput} innerObservable An Observable to replace each value from
|
||
|
|
* the source Observable.
|
||
|
|
* @param {function(outerValue: T, innerValue: I, outerIndex: number, innerIndex: number): any} [resultSelector]
|
||
|
|
* A function to produce the value on the output Observable based on the values
|
||
|
|
* and the indices of the source (outer) emission and the inner Observable
|
||
|
|
* emission. The arguments passed to this function are:
|
||
|
|
* - `outerValue`: the value that came from the source
|
||
|
|
* - `innerValue`: the value that came from the projected Observable
|
||
|
|
* - `outerIndex`: the "index" of the value that came from the source
|
||
|
|
* - `innerIndex`: the "index" of the value from the projected Observable
|
||
|
|
* @return {Observable} An Observable that emits items from the given
|
||
|
|
* `innerObservable` (and optionally transformed through `resultSelector`) every
|
||
|
|
* time a value is emitted on the source Observable, and taking only the values
|
||
|
|
* from the most recently projected inner Observable.
|
||
|
|
* @method switchMapTo
|
||
|
|
* @owner Observable
|
||
|
|
*/
|
||
|
|
function switchMapTo(innerObservable, resultSelector) {
|
||
|
|
return switchMapTo_1.switchMapTo(innerObservable, resultSelector)(this);
|
||
|
|
}
|
||
|
|
exports.switchMapTo = switchMapTo;
|
||
|
|
//# sourceMappingURL=switchMapTo.js.map
|