53 lines
2.6 KiB
JavaScript
53 lines
2.6 KiB
JavaScript
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/** PURE_IMPORTS_START .._operators_exhaustMap PURE_IMPORTS_END */
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import { exhaustMap as higherOrder } from '../operators/exhaustMap';
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/* tslint:enable:max-line-length */
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/**
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* Projects each source value to an Observable which is merged in the output
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* Observable only if the previous projected Observable has completed.
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*
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* <span class="informal">Maps each value to an Observable, then flattens all of
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* these inner Observables using {@link exhaust}.</span>
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*
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* <img src="./img/exhaustMap.png" width="100%">
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*
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* Returns an Observable that emits items based on applying a function that you
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* supply to each item emitted by the source Observable, where that function
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* returns an (so-called "inner") Observable. When it projects a source value to
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* an Observable, the output Observable begins emitting the items emitted by
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* that projected Observable. However, `exhaustMap` ignores every new projected
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* Observable if the previous projected Observable has not yet completed. Once
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* that one completes, it will accept and flatten the next projected Observable
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* and repeat this process.
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*
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* @example <caption>Run a finite timer for each click, only if there is no currently active timer</caption>
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* var clicks = Rx.Observable.fromEvent(document, 'click');
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* var result = clicks.exhaustMap((ev) => Rx.Observable.interval(1000).take(5));
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* result.subscribe(x => console.log(x));
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*
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* @see {@link concatMap}
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* @see {@link exhaust}
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* @see {@link mergeMap}
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* @see {@link switchMap}
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*
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* @param {function(value: T, ?index: number): ObservableInput} project A function
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* that, when applied to an item emitted by the source Observable, returns an
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* 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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* @return {Observable} An Observable containing projected Observables
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* of each item of the source, ignoring projected Observables that start before
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* their preceding Observable has completed.
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* @method exhaustMap
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* @owner Observable
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*/
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export function exhaustMap(project, resultSelector) {
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return higherOrder(project, resultSelector)(this);
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}
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//# sourceMappingURL=exhaustMap.js.map
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