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64 lines
2.9 KiB
64 lines
2.9 KiB
"use strict"; |
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var concatMap_1 = require('./concatMap'); |
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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 a serialized fashion on the output Observable. |
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* |
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* <span class="informal">It's like {@link concatMap}, but maps each value |
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* always to the same inner Observable.</span> |
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* |
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* <img src="./img/concatMapTo.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 flattens those resulting Observables into one |
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* single Observable, which is the output Observable. Each new `innerObservable` |
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* instance emitted on the output Observable is concatenated with the previous |
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* `innerObservable` instance. |
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* |
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* __Warning:__ if source values arrive endlessly and faster than their |
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* corresponding inner Observables can complete, it will result in memory issues |
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* as inner Observables amass in an unbounded buffer waiting for their turn to |
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* be subscribed to. |
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* |
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* Note: `concatMapTo` is equivalent to `mergeMapTo` with concurrency parameter |
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* set to `1`. |
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* |
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* @example <caption>For each click event, tick every second from 0 to 3, with no concurrency</caption> |
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* var clicks = Rx.Observable.fromEvent(document, 'click'); |
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* var result = clicks.concatMapTo(Rx.Observable.interval(1000).take(4)); |
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* result.subscribe(x => console.log(x)); |
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* |
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* // Results in the following: |
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* // (results are not concurrent) |
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* // For every click on the "document" it will emit values 0 to 3 spaced |
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* // on a 1000ms interval |
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* // one click = 1000ms-> 0 -1000ms-> 1 -1000ms-> 2 -1000ms-> 3 |
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* |
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* @see {@link concat} |
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* @see {@link concatAll} |
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* @see {@link concatMap} |
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* @see {@link mergeMapTo} |
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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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* @return {Observable} An observable of values merged together by joining the |
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* passed observable with itself, one after the other, for each value emitted |
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* from the source. |
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* @method concatMapTo |
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* @owner Observable |
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*/ |
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function concatMapTo(innerObservable, resultSelector) { |
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return concatMap_1.concatMap(function () { return innerObservable; }, resultSelector); |
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} |
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exports.concatMapTo = concatMapTo; |
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//# sourceMappingURL=concatMapTo.js.map
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