23 lines
1.0 KiB
JavaScript
23 lines
1.0 KiB
JavaScript
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/** PURE_IMPORTS_START .._operators_single PURE_IMPORTS_END */
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import { single as higherOrder } from '../operators/single';
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/**
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* Returns an Observable that emits the single item emitted by the source Observable that matches a specified
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* predicate, if that Observable emits one such item. If the source Observable emits more than one such item or no
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* such items, notify of an IllegalArgumentException or NoSuchElementException respectively.
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*
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* <img src="./img/single.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 - A predicate function to evaluate items emitted by the source Observable.
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* @return {Observable<T>} An Observable that emits the single item emitted by the source Observable that matches
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* the predicate.
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.
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* @method single
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* @owner Observable
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*/
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export function single(predicate) {
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return higherOrder(predicate)(this);
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}
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//# sourceMappingURL=single.js.map
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