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55 lines
2.6 KiB
55 lines
2.6 KiB
"use strict"; |
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var switchMap_1 = require('../operators/switchMap'); |
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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, emitting values only from the most recently projected Observable. |
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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 switch}.</span> |
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* |
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* <img src="./img/switchMap.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. Each time it observes one of these |
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* inner Observables, the output Observable begins emitting the items emitted by |
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* that inner Observable. When a new inner Observable is emitted, `switchMap` |
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* stops emitting items from the earlier-emitted inner Observable and begins |
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* emitting items from the new one. It continues to behave like this for |
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* subsequent inner Observables. |
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* |
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* @example <caption>Rerun an interval Observable on every click event</caption> |
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* var clicks = Rx.Observable.fromEvent(document, 'click'); |
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* var result = clicks.switchMap((ev) => Rx.Observable.interval(1000)); |
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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 exhaustMap} |
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* @see {@link mergeMap} |
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* @see {@link switch} |
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* @see {@link switchMapTo} |
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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 that emits the result of applying the |
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* projection function (and the optional `resultSelector`) to each item emitted |
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* by the source Observable and taking only the values from the most recently |
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* projected inner Observable. |
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* @method switchMap |
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* @owner Observable |
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*/ |
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function switchMap(project, resultSelector) { |
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return switchMap_1.switchMap(project, resultSelector)(this); |
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} |
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exports.switchMap = switchMap; |
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//# sourceMappingURL=switchMap.js.map
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