Can I catch certain errors before “subscribe()” in an RXJS observable in Angular2?

Question

Is it possible for a base class to catch certain errors before allowing the subclass to subscribe to the observable in Angular2.

e.g.

Answer 1

.catch() is the right one.

Observable is lazy, so there are no errors before you subscribe. Not sure if you mean this kind of "before" therefore I mention it just to be sure.