import { defaultIfEmpty as higherOrder } from '../operators/defaultIfEmpty'; /* tslint:enable:max-line-length */ /** * Emits a given value if the source Observable completes without emitting any * `next` value, otherwise mirrors the source Observable. * * If the source Observable turns out to be empty, then * this operator will emit a default value. * * * * `defaultIfEmpty` emits the values emitted by the source Observable or a * specified default value if the source Observable is empty (completes without * having emitted any `next` value). * * @example If no clicks happen in 5 seconds, then emit "no clicks" * var clicks = Rx.Observable.fromEvent(document, 'click'); * var clicksBeforeFive = clicks.takeUntil(Rx.Observable.interval(5000)); * var result = clicksBeforeFive.defaultIfEmpty('no clicks'); * result.subscribe(x => console.log(x)); * * @see {@link empty} * @see {@link last} * * @param {any} [defaultValue=null] The default value used if the source * Observable is empty. * @return {Observable} An Observable that emits either the specified * `defaultValue` if the source Observable emits no items, or the values emitted * by the source Observable. * @method defaultIfEmpty * @owner Observable */ export function defaultIfEmpty(defaultValue = null) { return higherOrder(defaultValue)(this); } //# sourceMappingURL=defaultIfEmpty.js.map