• Lists
• In scalar context, returns the last item of the list
• In list context, returns the entire list
• Arrays
• In scalar context, returns the length of the array
• In list context, returns the entire array
• Hashes
• In scalar context, returns a measure of the space used
• In list context, returns the entire hash

        $last_item = qw(goldfish cat dog); # $last_item = "dog";
        @pets      = qw(goldfish cat dog); # entire list

        $count     = @pets;                # $count = 3;
        @new_pets  = @pets;                # entire array

        %pets      = (goldfish => "glub",
                      cat      => "meow",
                      dog      => "woof");
        $boolean   = %pets;                # true
        @mix       = %pets;                # ("goldfish", ..., "woof")
        %new_pets  = %pets;                # entire hash