work.suroh.tk/node_modules/rxjs/_esm2015/operator/mergeMapTo.js

49 lines
2.3 KiB
JavaScript

import { mergeMapTo as higherOrder } from '../operators/mergeMapTo';
/* tslint:enable:max-line-length */
/**
* Projects each source value to the same Observable which is merged multiple
* times in the output Observable.
*
* <span class="informal">It's like {@link mergeMap}, but maps each value always
* to the same inner Observable.</span>
*
* <img src="./img/mergeMapTo.png" width="100%">
*
* Maps each source value to the given Observable `innerObservable` regardless
* of the source value, and then merges those resulting Observables into one
* single Observable, which is the output Observable.
*
* @example <caption>For each click event, start an interval Observable ticking every 1 second</caption>
* var clicks = Rx.Observable.fromEvent(document, 'click');
* var result = clicks.mergeMapTo(Rx.Observable.interval(1000));
* result.subscribe(x => console.log(x));
*
* @see {@link concatMapTo}
* @see {@link merge}
* @see {@link mergeAll}
* @see {@link mergeMap}
* @see {@link mergeScan}
* @see {@link switchMapTo}
*
* @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
* @param {number} [concurrent=Number.POSITIVE_INFINITY] Maximum number of input
* Observables being subscribed to concurrently.
* @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.
* @method mergeMapTo
* @owner Observable
*/
export function mergeMapTo(innerObservable, resultSelector, concurrent = Number.POSITIVE_INFINITY) {
return higherOrder(innerObservable, resultSelector, concurrent)(this);
}
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