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1 line
3.7 KiB
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{"version":3,"file":"switchMap.js","sourceRoot":"","sources":["../../src/operator/switchMap.ts"],"names":[],"mappings":";AAEA,0BAAkD,wBAAwB,CAAC,CAAA;AAK3E,mCAAmC;AAEnC;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;GA8CG;AACH,mBAAwD,OAAwD,EAC7E,cAA4F;IAC7H,MAAM,CAAC,qBAAoB,CAAC,OAAO,EAAE,cAAc,CAAC,CAAC,IAAI,CAAC,CAAC;AAC7D,CAAC;AAHe,iBAAS,YAGxB,CAAA","sourcesContent":["\nimport { Observable, ObservableInput } from '../Observable';\nimport { switchMap as higherOrderSwitchMap } from '../operators/switchMap';\n\n/* tslint:disable:max-line-length */\nexport function switchMap<T, R>(this: Observable<T>, project: (value: T, index: number) => ObservableInput<R>): Observable<R>;\nexport function switchMap<T, I, R>(this: Observable<T>, project: (value: T, index: number) => ObservableInput<I>, resultSelector: (outerValue: T, innerValue: I, outerIndex: number, innerIndex: number) => R): Observable<R>;\n/* tslint:enable:max-line-length */\n\n/**\n * Projects each source value to an Observable which is merged in the output\n * Observable, emitting values only from the most recently projected Observable.\n *\n * <span class=\"informal\">Maps each value to an Observable, then flattens all of\n * these inner Observables using {@link switch}.</span>\n *\n * <img src=\"./img/switchMap.png\" width=\"100%\">\n *\n * Returns an Observable that emits items based on applying a function that you\n * supply to each item emitted by the source Observable, where that function\n * returns an (so-called \"inner\") Observable. Each time it observes one of these\n * inner Observables, the output Observable begins emitting the items emitted by\n * that inner Observable. When a new inner Observable is emitted, `switchMap`\n * stops emitting items from the earlier-emitted inner Observable and begins\n * emitting items from the new one. It continues to behave like this for\n * subsequent inner Observables.\n *\n * @example <caption>Rerun an interval Observable on every click event</caption>\n * var clicks = Rx.Observable.fromEvent(document, 'click');\n * var result = clicks.switchMap((ev) => Rx.Observable.interval(1000));\n * result.subscribe(x => console.log(x));\n *\n * @see {@link concatMap}\n * @see {@link exhaustMap}\n * @see {@link mergeMap}\n * @see {@link switch}\n * @see {@link switchMapTo}\n *\n * @param {function(value: T, ?index: number): ObservableInput} project A function\n * that, when applied to an item emitted by the source Observable, returns an\n * 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 that emits the result of applying the\n * projection function (and the optional `resultSelector`) to each item emitted\n * by the source Observable and taking only the values from the most recently\n * projected inner Observable.\n * @method switchMap\n * @owner Observable\n */\nexport function switchMap<T, I, R>(this: Observable<T>, project: (value: T, index: number) => ObservableInput<I>,\n resultSelector?: (outerValue: T, innerValue: I, outerIndex: number, innerIndex: number) => R): Observable<I | R> {\n return higherOrderSwitchMap(project, resultSelector)(this);\n}\n"]} |