catch
RxJS 5 catch
HTML
<script src="https://npmcdn.com/@reactivex/[email protected]/dist/global/Rx.umd.js"></script>JavaScript
//emit error
const source = Rx.Observable.throw('This is an error!');
//gracefully handle error, returning observable with error message
const example = source.catch(val => Rx.Observable.of(`I caught: ${val}`));
//output: 'I caught: This is an error'
const subscribe = example.subscribe(val => console.log(val));