14 lines
704 B
TypeScript
14 lines
704 B
TypeScript
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import { Observable } from '../Observable';
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/**
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* Returns an Observable that applies a specified accumulator function to each item emitted by the source Observable.
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* If a seed value is specified, then that value will be used as the initial value for the accumulator.
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* If no seed value is specified, the first item of the source is used as the seed.
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* @param {function} accumulator The accumulator function called on each item.
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*
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* <img src="./img/scan.png" width="100%">
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*
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* @param {any} [seed] The initial accumulator value.
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* @returns {Obervable} An observable of the accumulated values.
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*/
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export declare function scan<T, R>(accumulator: (acc: R, x: T) => R, seed?: T | R): Observable<R>;
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