Rx.Observable.prototype.catch(second | handler)

Continues an observable sequence that is terminated by an exception with the next observable sequence. There is an alias for this method catchException for browsers <IE9

Arguments

1. second (Observable): A second observable sequence used to produce results when an error occurred in the first sequence.
2. handler (Function): Exception handler function that returns an observable sequence given the error that occurred in the first sequence

Returns

(Observable): An observable sequence containing the first sequence's elements, followed by the elements of the handler sequence in case an exception occurred.

Example

Using a second observable

Using a handler function