25 lines
1.2 KiB
JavaScript
25 lines
1.2 KiB
JavaScript
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/** PURE_IMPORTS_START .._operators_last PURE_IMPORTS_END */
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import { last as higherOrder } from '../operators/last';
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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(predicate, resultSelector, defaultValue) {
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return higherOrder(predicate, resultSelector, defaultValue)(this);
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}
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//# sourceMappingURL=last.js.map
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