Sometimes you want to call a method when you don't know the
     method name ahead of time.  You can use the arrow form,
     replacing the method name with a simple scalar variable
     containing the method name or a reference to the function.

         $method = $fast ? "findfirst" : "findbest";
         $fred->$method(@args);          # call by name

         if ($coderef = $fred->can($parent . "::findbest")) {
             $self->$coderef(@args);     # call by coderef
         }