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node_modules/rxjs/src/operator/single.ts
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EvgeniyBudaev
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17 фев 2020, 09:02
17 фев 2020, 09:02
bb6f06f
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import { Observable } from '../Observable'; import { single as higherOrder } from '../operators/single'; /** * Returns an Observable that emits the single item emitted by the source Observable that matches a specified * predicate, if that Observable emits one such item. If the source Observable emits more than one such item or no * such items, notify of an IllegalArgumentException or NoSuchElementException respectively. * * <img src="./img/single.png" width="100%"> * * @throws {EmptyError} Delivers an EmptyError to the Observer's `error` * callback if the Observable completes before any `next` notification was sent. * @param {Function} predicate - A predicate function to evaluate items emitted by the source Observable. * @return {Observable<T>} An Observable that emits the single item emitted by the source Observable that matches * the predicate. . * @method single * @owner Observable */ export function single<T>(this: Observable<T>, predicate?: (value: T, index: number, source: Observable<T>) => boolean): Observable<T> { return higherOrder(predicate)(this); }