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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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Ultimate RxJS
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Examples

Example 1: Retry 2 times on error
// 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