defaultIfEmpty - 2
RxJS 5 defaultIfEmpty
HTML
<script src="https://npmcdn.com/@reactivex/[email protected]/dist/global/Rx.umd.js"></script>JavaScript
//empty observable
const empty = Rx.Observable.empty();
//emit 'Observable.empty()!' when empty, else any values from source
const example = empty.defaultIfEmpty('Observable.empty()!');
//output: 'Observable.empty()!'
const subscribe = example.subscribe(val => console.log(val));