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47 lines
2.9 KiB
47 lines
2.9 KiB
import { Observable } from '../Observable';
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import { last as higherOrder } from '../operators/last';
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/* tslint:disable:max-line-length */
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export function last<T, S extends T>(this: Observable<T>,
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predicate: (value: T, index: number, source: Observable<T>) => value is S): Observable<S>;
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export function last<T, S extends T, R>(this: Observable<T>,
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predicate: (value: T | S, index: number, source: Observable<T>) => value is S,
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resultSelector: (value: S, index: number) => R, defaultValue?: R): Observable<R>;
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export function last<T, S extends T>(this: Observable<T>,
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predicate: (value: T, index: number, source: Observable<T>) => value is S,
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resultSelector: void,
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defaultValue?: S): Observable<S>;
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export function last<T>(this: Observable<T>,
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predicate?: (value: T, index: number, source: Observable<T>) => boolean): Observable<T>;
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export function last<T, R>(this: Observable<T>,
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predicate: (value: T, index: number, source: Observable<T>) => boolean,
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resultSelector?: (value: T, index: number) => R,
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defaultValue?: R): Observable<R>;
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export function last<T>(this: Observable<T>,
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predicate: (value: T, index: number, source: Observable<T>) => boolean,
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resultSelector: void,
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defaultValue?: T): Observable<T>;
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/* tslint:enable:max-line-length */
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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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* @throws {EmptyError} Delivers an EmptyError to the Observer's `error`
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* callback if the Observable completes before any `next` notification was sent.
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* @param {function} predicate - The condition any source emitted item has to satisfy.
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* @return {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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* @method last
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* @owner Observable
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*/
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export function last<T, R>(this: Observable<T>, predicate?: (value: T, index: number, source: Observable<T>) => boolean,
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resultSelector?: ((value: T, index: number) => R) | void,
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defaultValue?: R): Observable<T | R> {
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return higherOrder(predicate, resultSelector as any, defaultValue)(this);
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}
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