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3.8 KiB
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{"version":3,"file":"concatMapTo.js","sourceRoot":"","sources":["../../src/operators/concatMapTo.ts"],"names":[],"mappings":";AACA,0BAA0B,aAAa,CAAC,CAAA;AAMxC,mCAAmC;AAEnC;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;GAuDG;AACH,qBACE,eAA8B,EAC9B,cAA4F;IAE5F,MAAM,CAAC,qBAAS,CAAC,cAAM,OAAA,eAAe,EAAf,CAAe,EAAE,cAAc,CAAC,CAAC;AAC1D,CAAC;AALe,mBAAW,cAK1B,CAAA","sourcesContent":["import { Observable, ObservableInput } from '../Observable';\nimport { concatMap } from './concatMap';\nimport { OperatorFunction } from '../interfaces';\n\n/* tslint:disable:max-line-length */\nexport function concatMapTo<T, R>(observable: ObservableInput<R>): OperatorFunction<T, R>;\nexport function concatMapTo<T, I, R>(observable: ObservableInput<I>, resultSelector: (outerValue: T, innerValue: I, outerIndex: number, innerIndex: number) => R): OperatorFunction<T, R>;\n/* tslint:enable:max-line-length */\n\n/**\n * Projects each source value to the same Observable which is merged multiple\n * times in a serialized fashion on the output Observable.\n *\n * <span class=\"informal\">It's like {@link concatMap}, but maps each value\n * always to the same inner Observable.</span>\n *\n * <img src=\"./img/concatMapTo.png\" width=\"100%\">\n *\n * Maps each source value to the given Observable `innerObservable` regardless\n * of the source value, and then flattens those resulting Observables into one\n * single Observable, which is the output Observable. Each new `innerObservable`\n * instance emitted on the output Observable is concatenated with the previous\n * `innerObservable` instance.\n *\n * __Warning:__ if source values arrive endlessly and faster than their\n * corresponding inner Observables can complete, it will result in memory issues\n * as inner Observables amass in an unbounded buffer waiting for their turn to\n * be subscribed to.\n *\n * Note: `concatMapTo` is equivalent to `mergeMapTo` with concurrency parameter\n * set to `1`.\n *\n * @example <caption>For each click event, tick every second from 0 to 3, with no concurrency</caption>\n * var clicks = Rx.Observable.fromEvent(document, 'click');\n * var result = clicks.concatMapTo(Rx.Observable.interval(1000).take(4));\n * result.subscribe(x => console.log(x));\n *\n * // Results in the following:\n * // (results are not concurrent)\n * // For every click on the \"document\" it will emit values 0 to 3 spaced\n * // on a 1000ms interval\n * // one click = 1000ms-> 0 -1000ms-> 1 -1000ms-> 2 -1000ms-> 3\n *\n * @see {@link concat}\n * @see {@link concatAll}\n * @see {@link concatMap}\n * @see {@link mergeMapTo}\n * @see {@link switchMapTo}\n *\n * @param {ObservableInput} innerObservable An Observable to replace each value from\n * the source Observable.\n * @param {function(outerValue: T, innerValue: I, outerIndex: number, innerIndex: number): any} [resultSelector]\n * A function to produce the value on the output Observable based on the values\n * and the indices of the source (outer) emission and the inner Observable\n * emission. The arguments passed to this function are:\n * - `outerValue`: the value that came from the source\n * - `innerValue`: the value that came from the projected Observable\n * - `outerIndex`: the \"index\" of the value that came from the source\n * - `innerIndex`: the \"index\" of the value from the projected Observable\n * @return {Observable} An observable of values merged together by joining the\n * passed observable with itself, one after the other, for each value emitted\n * from the source.\n * @method concatMapTo\n * @owner Observable\n */\nexport function concatMapTo<T, I, R>(\n innerObservable: Observable<I>,\n resultSelector?: (outerValue: T, innerValue: I, outerIndex: number, innerIndex: number) => R\n): OperatorFunction<T, R> {\n return concatMap(() => innerObservable, resultSelector);\n}\n"]} |