recoder-code
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12 lines • 464 B
JavaScript
import { switchMap } from './switchMap';
import { operate } from '../util/lift';
export function switchScan(accumulator, seed) {
return operate((source, subscriber) => {
let state = seed;
switchMap((value, index) => accumulator(state, value, index), (_, innerValue) => ((state = innerValue), innerValue))(source).subscribe(subscriber);
return () => {
state = null;
};
});
}
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