16 lines
1008 B
TypeScript
16 lines
1008 B
TypeScript
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import { Observable } from '../Observable';
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/**
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* Returns an Observable that emits only the last item emitted by the source Observable.
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* It optionally takes a predicate function as a parameter, in which case, rather than emitting
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* the last item from the source Observable, the resulting Observable will emit the last item
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* from the source Observable that satisfies the predicate.
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*
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* <img src="./img/last.png" width="100%">
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*
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* @param {function} predicate - the condition any source emitted item has to satisfy.
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* @returns {Observable} an Observable that emits only the last item satisfying the given condition
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* from the source, or an NoSuchElementException if no such items are emitted.
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* @throws - Throws if no items that match the predicate are emitted by the source Observable.
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*/
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export declare function last<T, R>(predicate?: (value: T, index: number, source: Observable<T>) => boolean, resultSelector?: (value: T, index: number) => R, defaultValue?: R): Observable<T> | Observable<R>;
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