Testing Uninitialized Vars

[perl]

I wan to write a sub return true or false if the var was initialized.

Can someone correct this sub or is it good?

 ...
 if(isNULL($x) { print "it is null\n");
 else          { print "it is NOT null\n");
 ...

sub isNULL
{
  return $_[0] =~ //
}

thanks,
-rkl

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