rxjs/dist/esm/internal/operators/defaultIfEmpty.js

Reactive Extensions for modern JavaScript

import { operate } from '../util/lift';
import { OperatorSubscriber } from './OperatorSubscriber';
export function defaultIfEmpty(defaultValue) {
    return operate((source, subscriber) => {
        let hasValue = false;
        source.subscribe(new OperatorSubscriber(subscriber, (value) => {
            hasValue = true;
            subscriber.next(value);
        }, () => {
            if (!hasValue) {
                subscriber.next(defaultValue);
            }
            subscriber.complete();
        }));
    });
}
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