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The output Observables\n * emits values only from the most recently emitted instance of\n * `innerObservable`.\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.switchMapTo(Rx.Observable.interval(1000));\n * result.subscribe(x => console.log(x));\n *\n * @see {@link concatMapTo}\n * @see {@link switch}\n * @see {@link switchMap}\n * @see {@link mergeMapTo}\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 that emits items from the given\n * `innerObservable` (and optionally transformed through `resultSelector`) every\n * time a value is emitted on the source Observable, and taking only the values\n * from the most recently projected inner Observable.\n * @method switchMapTo\n * @owner Observable\n */\nexport function switchMapTo<T, I, R>(innerObservable: Observable<I>,\n resultSelector?: (outerValue: T,\n innerValue: I,\n outerIndex: number,\n innerIndex: number) => R): OperatorFunction<T, I | R> {\n return (source: Observable<T>) => source.lift(new SwitchMapToOperator(innerObservable, resultSelector));\n}\n\nclass SwitchMapToOperator<T, I, R> implements Operator<T, I> {\n constructor(private observable: Observable<I>,\n private resultSelector?: (outerValue: T, innerValue: I, outerIndex: number, innerIndex: number) => R) {\n }\n\n call(subscriber: Subscriber<I>, source: any): any {\n return source.subscribe(new SwitchMapToSubscriber(subscriber, this.observable, this.resultSelector));\n }\n}\n\n/**\n * We need this JSDoc comment for affecting ESDoc.\n * @ignore\n * @extends {Ignored}\n */\nclass SwitchMapToSubscriber<T, I, R> extends OuterSubscriber<T, I> {\n private index: number = 0;\n private innerSubscription: Subscription;\n\n constructor(destination: Subscriber<I>,\n private inner: Observable<I>,\n private resultSelector?: (outerValue: T, innerValue: I, outerIndex: number, innerIndex: number) => R) {\n super(destination);\n }\n\n protected _next(value: any) {\n const innerSubscription = this.innerSubscription;\n if (innerSubscription) {\n innerSubscription.unsubscribe();\n }\n this.add(this.innerSubscription = subscribeToResult(this, this.inner, value, this.index++));\n }\n\n protected _complete() {\n const {innerSubscription} = this;\n if (!innerSubscription || innerSubscription.closed) {\n super._complete();\n }\n }\n\n /** @deprecated internal use only */ _unsubscribe() {\n this.innerSubscription = null;\n }\n\n notifyComplete(innerSub: Subscription) {\n this.remove(innerSub);\n this.innerSubscription = null;\n if (this.isStopped) {\n super._complete();\n }\n }\n\n notifyNext(outerValue: T, innerValue: I,\n outerIndex: number, innerIndex: number,\n innerSub: InnerSubscriber<T, I>): void {\n const { resultSelector, destination } = this;\n if (resultSelector) {\n this.tryResultSelector(outerValue, innerValue, outerIndex, innerIndex);\n } else {\n destination.next(innerValue);\n }\n }\n\n private tryResultSelector(outerValue: T, innerValue: I,\n outerIndex: number, innerIndex: number): void {\n const { resultSelector, destination } = this;\n let result: R;\n try {\n result = resultSelector(outerValue, innerValue, outerIndex, innerIndex);\n } catch (err) {\n destination.error(err);\n return;\n }\n\n destination.next(result);\n }\n}\n"]}
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