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import { Subscriber } from '../Subscriber'; import { ObservableInput, OperatorFunction, ObservedValueOf } from '../types'; import { innerFrom } from '../observable/innerFrom'; import { operate } from '../util/lift'; import { createOperatorSubscriber } from './OperatorSubscriber'; /* tslint:disable:max-line-length */ export function switchMap<T, O extends ObservableInput<any>>( project: (value: T, index: number) => O ): OperatorFunction<T, ObservedValueOf<O>>; /** @deprecated The `resultSelector` parameter will be removed in v8. Use an inner `map` instead. Details: https://rxjs.dev/deprecations/resultSelector */ export function switchMap<T, O extends ObservableInput<any>>( project: (value: T, index: number) => O, resultSelector: undefined ): OperatorFunction<T, ObservedValueOf<O>>; /** @deprecated The `resultSelector` parameter will be removed in v8. Use an inner `map` instead. Details: https://rxjs.dev/deprecations/resultSelector */ export function switchMap<T, R, O extends ObservableInput<any>>( project: (value: T, index: number) => O, resultSelector: (outerValue: T, innerValue: ObservedValueOf<O>, outerIndex: number, innerIndex: number) => R ): OperatorFunction<T, R>; /* tslint:enable:max-line-length */ /** * Projects each source value to an Observable which is merged in the output * Observable, emitting values only from the most recently projected Observable. * * <span class="informal">Maps each value to an Observable, then flattens all of * these inner Observables using {@link switchAll}.</span> * *  * * Returns an Observable that emits items based on applying a function that you * supply to each item emitted by the source Observable, where that function * returns an (so-called "inner") Observable. Each time it observes one of these * inner Observables, the output Observable begins emitting the items emitted by * that inner Observable. When a new inner Observable is emitted, `switchMap` * stops emitting items from the earlier-emitted inner Observable and begins * emitting items from the new one. It continues to behave like this for * subsequent inner Observables. * * ## Example * * Generate new Observable according to source Observable values * * ```ts * import { of, switchMap } from 'rxjs'; * * const switched = of(1, 2, 3).pipe(switchMap(x => of(x, x ** 2, x ** 3))); * switched.subscribe(x => console.log(x)); * // outputs * // 1 * // 1 * // 1 * // 2 * // 4 * // 8 * // 3 * // 9 * // 27 * ``` * * Restart an interval Observable on every click event * * ```ts * import { fromEvent, switchMap, interval } from 'rxjs'; * * const clicks = fromEvent(document, 'click'); * const result = clicks.pipe(switchMap(() => interval(1000))); * result.subscribe(x => console.log(x)); * ``` * * @see {@link concatMap} * @see {@link exhaustMap} * @see {@link mergeMap} * @see {@link switchAll} * @see {@link switchMapTo} * * @param project A function that, when applied to an item emitted by the source * Observable, returns an Observable. * @return A function that returns an Observable that emits the result of * applying the projection function (and the optional deprecated * `resultSelector`) to each item emitted by the source Observable and taking * only the values from the most recently projected inner Observable. */ export function switchMap<T, R, O extends ObservableInput<any>>( project: (value: T, index: number) => O, resultSelector?: (outerValue: T, innerValue: ObservedValueOf<O>, outerIndex: number, innerIndex: number) => R ): OperatorFunction<T, ObservedValueOf<O> | R> { return operate((source, subscriber) => { let innerSubscriber: Subscriber<ObservedValueOf<O>> | null = null; let index = 0; // Whether or not the source subscription has completed let isComplete = false; // We only complete the result if the source is complete AND we don't have an active inner subscription. // This is called both when the source completes and when the inners complete. const checkComplete = () => isComplete && !innerSubscriber && subscriber.complete(); source.subscribe( createOperatorSubscriber( subscriber, (value) => { // Cancel the previous inner subscription if there was one innerSubscriber?.unsubscribe(); let innerIndex = 0; const outerIndex = index++; // Start the next inner subscription innerFrom(project(value, outerIndex)).subscribe( (innerSubscriber = createOperatorSubscriber( subscriber, // When we get a new inner value, next it through. Note that this is // handling the deprecate result selector here. This is because with this architecture // it ends up being smaller than using the map operator. (innerValue) => subscriber.next(resultSelector ? resultSelector(value, innerValue, outerIndex, innerIndex++) : innerValue), () => { // The inner has completed. Null out the inner subscriber to // free up memory and to signal that we have no inner subscription // currently. innerSubscriber = null!; checkComplete(); } )) ); }, () => { isComplete = true; checkComplete(); } ) ); }); }
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