Same idea, but with a generator:

use strict;
use warnings;

sub make_generator {
   my ($lists) = @_;

   my @ranges = map { [ 0..$#$_ ] } @$lists;

   my $glob_string = join '\\ ', 
                     map { '{'.join(',', @$_).'}' }
                     @ranges;

   return sub {
      local $_ = scalar glob $glob_string;
      return unless defined $_;
      my $i = 0;
      return [ map { $lists[$i++][$_] } split ];
   }
};

{
   my @lists = (
      [ qw/A B C D E F/ ],
      [ qw/1 2 3 4 5 6/ ],
      [ qw/apple orange pomegranate grape/ ],
      [ qw/wolf lion dog cat cow ape whale/ ],
   );

   my $generator = make_generator(\@lists);

   print(join(' ', @$_), $/)
      while ($_ = &$generator());
}

[download]

In reply to Re^2: generating combinations of elements of an arbitrary number of arrays by ikegami
in thread generating combinations of elements of an arbitrary number of arrays by mickey

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