Are These Items Found in Those Lists?

Challenge: Sometimes we want to know in which of several lists one or more items can be found.

Response: Two new methods: is_member_which() and are_members_which().

•     @memb_arr = $lcm->is_member_which('golfer');
  
      # @memb_arr will hold:  ( 0, 1, 2 )

•     $memb_hash_ref = $lcm->are_members_which(
                       [ qw| abel baker fargo hilton zebra | ] );
  
      # $memb_hash_ref will be:
  
      {
           abel     => [ 0             ],
           baker    => [ 0, 1          ],
           fargo    => [ 0, 1, 2, 3, 4 ],
           hilton   => [    1, 2       ],
           zebra    => [               ],
      };