Safer Polymorphism with Exceptions

Sometimes, it is cool to just call a method.  If it is not defined, the program dies and you correct the situation.  Sometimes it is not cool.

Perl uses die and eval to provide runtime exception handling.

    eval {
      print $object->foo; # Calls die() without foo.
    };
    if ($@) {
      warn "object has no attribute foo";
    }