Why Bother with Objects?

• Challenge: Why bother with the overhead cost of creating a List::Compare object?

• Response: A faster but less elegant interface: List::Compare::Functional

      use List::Compare::Functional qw( get_union get_complement );
  
      @union = get_union( [ \@Al, \@Bob, \@Carmen, \@Don, \@Ed ] );

• No constructor, so lists must be passed each time a function is called.

• References to lists are themselves placed in a list. A reference to that is passed to the function.

• Where a function needs extra arguments, these must also be wrapped in an array which is passed by reference to the function.

      @complement_Don = 
          get_complement( [ \@Al, \@Bob, \@Carmen, \@Don, \@Ed ],
                          [ 3 ]  );