24 lines
1.1 KiB
JavaScript
24 lines
1.1 KiB
JavaScript
import { innerFrom } from '../observable/innerFrom';
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import { operate } from '../util/lift';
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import { createOperatorSubscriber } from './OperatorSubscriber';
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export function switchMap(project, resultSelector) {
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return operate((source, subscriber) => {
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let innerSubscriber = null;
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let index = 0;
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let isComplete = false;
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const checkComplete = () => isComplete && !innerSubscriber && subscriber.complete();
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source.subscribe(createOperatorSubscriber(subscriber, (value) => {
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innerSubscriber === null || innerSubscriber === void 0 ? void 0 : innerSubscriber.unsubscribe();
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let innerIndex = 0;
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const outerIndex = index++;
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innerFrom(project(value, outerIndex)).subscribe((innerSubscriber = createOperatorSubscriber(subscriber, (innerValue) => subscriber.next(resultSelector ? resultSelector(value, innerValue, outerIndex, innerIndex++) : innerValue), () => {
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innerSubscriber = null;
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checkComplete();
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})));
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}, () => {
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isComplete = true;
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checkComplete();
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}));
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});
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}
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//# sourceMappingURL=switchMap.js.map
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