C<isa> returns I<true> if its object is blessed into a subclass of C<CLASS>
-You can also call C<UNIVERSAL::isa> as a sub with two arguments. The
-first does not need to be an object or even a reference. This
-allows the ability to check what a reference points to, or whether
+You can also call C<UNIVERSAL::isa> as a subroutine with two arguments.
+The first does not need to be an object or even a reference. This
+allows you to check what a reference points to, or whether
something is a reference of a given type. Example
if(UNIVERSAL::isa($ref, 'ARRAY')) {
#...
}
+To determine if a reference is a blessed object, you can write
+
+ print "It's an object\n" if UNIVERSAL::isa($val, 'UNIVERSAL');
+
=item can(METHOD)
C<can> checks to see if its object has a method called C<METHOD>,
if it does then a reference to the sub is returned, if it does not then
I<undef> is returned.
+C<UNIVERSAL::can> can also be called as a subroutine with two arguments.
+It'll always return I<undef> if its first argument isn't an object or a
+class name. So here's another way to check if a reference is a
+blessed object
+
+ print "It's still an object\n" if UNIVERSAL::can($val, 'can');
+
=item VERSION( [NEED] )
C<VERSION> returns the version number of the class (package). If the