RxJs catch error and continue

Question

I have a list of items to parse, but the parsing of one of them can fail.

What is the \"Rx-Way\" to catch error but continue executing the sequence

Code Samp

Answer 1

You need to switch to a new disposable stream, and if an error occurs within it will be disposed safely, and keep the original stream alive:

Rx.Observable.from([0,1,2,3,4,5])
    .switchMap(value => {

        // This is the disposable stream!
        // Errors can safely occur in here without killing the original stream

        return Rx.Observable.of(value)
            .map(value => {
                if (value === 3) {
                    throw new Error('Value cannot be 3');
                }
                return value;
            })
            .catch(error => {
                // You can do some fancy stuff here with errors if you like
                // Below we are just returning the error object to the outer stream
                return Rx.Observable.of(error);
            });

    })
    .map(value => {
        if (value instanceof Error) {
            // Maybe do some error handling here
            return `Error: ${value.message}`;
        }
        return value;
    })
    .subscribe(
      (x => console.log('Success', x)),
      (x => console.log('Error', x)),
      (() => console.log('Complete'))
    );

More info on this technique in this blog post: The Quest for Meatballs: Continue RxJS Streams When Errors Occur