49 lines
2.3 KiB
JavaScript
49 lines
2.3 KiB
JavaScript
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import { mergeMapTo as higherOrder } from '../operators/mergeMapTo';
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/* tslint:enable:max-line-length */
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/**
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* Projects each source value to the same Observable which is merged multiple
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* times in the output Observable.
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*
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* <span class="informal">It's like {@link mergeMap}, but maps each value always
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* to the same inner Observable.</span>
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*
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* <img src="./img/mergeMapTo.png" width="100%">
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*
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* Maps each source value to the given Observable `innerObservable` regardless
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* of the source value, and then merges those resulting Observables into one
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* single Observable, which is the output Observable.
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*
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* @example <caption>For each click event, start an interval Observable ticking every 1 second</caption>
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* var clicks = Rx.Observable.fromEvent(document, 'click');
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* var result = clicks.mergeMapTo(Rx.Observable.interval(1000));
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* result.subscribe(x => console.log(x));
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*
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* @see {@link concatMapTo}
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* @see {@link merge}
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* @see {@link mergeAll}
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* @see {@link mergeMap}
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* @see {@link mergeScan}
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* @see {@link switchMapTo}
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*
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* @param {ObservableInput} innerObservable An Observable to replace each value from
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* the source Observable.
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* @param {function(outerValue: T, innerValue: I, outerIndex: number, innerIndex: number): any} [resultSelector]
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* A function to produce the value on the output Observable based on the values
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* and the indices of the source (outer) emission and the inner Observable
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* emission. The arguments passed to this function are:
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* - `outerValue`: the value that came from the source
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* - `innerValue`: the value that came from the projected Observable
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* - `outerIndex`: the "index" of the value that came from the source
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* - `innerIndex`: the "index" of the value from the projected Observable
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* @param {number} [concurrent=Number.POSITIVE_INFINITY] Maximum number of input
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* Observables being subscribed to concurrently.
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* @return {Observable} An Observable that emits items from the given
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* `innerObservable` (and optionally transformed through `resultSelector`) every
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* time a value is emitted on the source Observable.
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* @method mergeMapTo
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* @owner Observable
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*/
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export function mergeMapTo(innerObservable, resultSelector, concurrent = Number.POSITIVE_INFINITY) {
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return higherOrder(innerObservable, resultSelector, concurrent)(this);
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}
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//# sourceMappingURL=mergeMapTo.js.map
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