How do you deal with errors in Observables

Question

With the help of an example, can u please tell me How do you deal with errors in Observables?

Answer 1

To handle errors in Observables, use the following techniques:

1. catchError Operator

Catches errors and allows you to provide a fallback value or rethrow the error.

Example:

observable$.pipe(

  catchError((error) => {

    console.error('Error:', error);

    return of('Fallback Value'); // Emit a fallback value

  })

).subscribe((value) => console.log(value));

2. retry Operator

Retries the Observable a specified number of times on error.

Example:

observable$.pipe(

  retry(3) // Retry up to 3 times

).subscribe((value) => console.log(value));

3. retryWhen Operator

Retries the Observable based on custom logic (e.g., after a delay).

Example:

observable$.pipe(

  retryWhen((errors) => errors.pipe(delay(1000))) // Retry after 1 second

).subscribe((value) => console.log(value));

4. Error Callback in subscribe

Handle errors in the subscribe method.