retry

signature: retry(number: number): Observable

Retry an observable sequence a specific number of times should an error occur.

Examples

Example 1: Retry 2 times on error

( jsBin |
jsFiddle )

import { interval } from 'rxjs/observable/interval';
import { of } from 'rxjs/observable/of';
import { _throw } from 'rxjs/observable/throw';
import { mergeMap, retry } 'rxjs/operators';
//emit value every 1s
const source = interval(1000);
const example = source.pipe(
  mergeMap(val => {
    //throw error for demonstration
    if (val > 5) {
      return _throw('Error!');
    }
    return of(val);
  }),
  //retry 2 times on error
  retry(2)
);
/*
  output:
  0..1..2..3..4..5..
  0..1..2..3..4..5..
  0..1..2..3..4..5..
  "Error!: Retried 2 times then quit!"
*/
const subscribe = example.subscribe({
  next: val => console.log(val),
  error: val => console.log(`${val}: Retried 2 times then quit!`)
});

Additional Resources

• retry
  - Official docs
• Error handling operator: retry and retryWhen
  - André Staltz

Source Code:
https://github.com/ReactiveX/rxjs/blob/master/src/internal/operators/retry.ts