retry

signature: retry(number: number): Observable
Retry an observable sequence a specific number of times should an error occur.
💡 Useful for retrying HTTP requests!
💡 If you only want to retry in certain cases, check out retryWhen!
💡 For non error cases check out repeat!
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Examples
Example 1: Retry 2 times on error
( StackBlitz | jsBin | jsFiddle )
// RxJS v6+
import { interval, of, throwError } from 'rxjs';
import { mergeMap, retry } from 'rxjs/operators';
​
//emit value every 1s
const source = interval(1000);
const example = source.pipe(
  mergeMap(val => {
    //throw error for demonstration
    if (val > 5) {
      return throwError('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
​retry - In Depth Dev Reference
​Error handling operator: retry and retryWhen​
🎥 💵 - André Staltz
📁 Source Code: https://github.com/ReactiveX/rxjs/blob/master/src/internal/operators/retry.ts​

catch / catchError

retryWhen

Last modified 2yr ago