How to prevent Observable from stopping?

Question

JavaScript

There is such a code, in case of an error, the interval stops, and the observable becomes executed, how to prevent this?

Observable.interval(3000)
            .do(value => console.log('attempt #', value))
            .switchMap(() => this.http.get(url))
            .catch (err => Observable.empty())
            .subscribe(data => console.log(data));

Answer 1

You need to create a new Observable inside switchMap that will catch the error:

Observable.interval(3000)
            .do(value => console.log('attempt #', value))
            .switchMap(() => Observable.defer(() => this.http.get(url))
                  .map(data => data)
                  .catch(err => console.log(err))
            )
            .catch (err => Observable.empty())
            .subscribe(data => console.log(data));