how to use the onerrorresumenext function from the rxjs library in javascript

The onErrorResumeNext operator from the rxjs library is used to handle errors that may occur while processing an Observable stream. The operator allows the program to continue the execution of the Observable stream even if an error has occurred.

Here's an example:

import { of } from 'rxjs';
import { onErrorResumeNext } from 'rxjs/operators';

const observable = onErrorResumeNext(
  of(1, 2, 3),
  of(4, 5, 6).pipe(
    map(num => {
      if (num === 5) {
        throw new Error('Number is 5');
      }
      return num;
    })
  ),
  of(7, 8, 9)
);

observable.subscribe(
  value => console.log(value),
  error => console.error(error)
);
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In this example, we're creating an Observable stream using the of operator. We pass three different of Observables to the onErrorResumeNext operator.

The second of Observable has a map operator which throws an error if the value of num is equal to 5.

By using the onErrorResumeNext operator, we can continue processing the stream even if the error occurs in the second of Observable.

The output of the program will be:

index.tsx
1
2
3
4
6
7
8
9
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9 lines

As you can see, the number 5 is skipped and the program continues to execute the rest of the Observables in the stream. This is the main advantage of using the onErrorResumeNext operator to handle errors in an Observable stream.