If I had a list of arrays, and I wanted each element of these arrays to be keys with the array as the value. I can do this in perl but how do I do that in ruby? Seems that this is a syntax error: {[%w[a b c],%w[x y z]].each{|a| a.each{|v| v=>a}}}

hash_from_arrays.pl

use strict;
use warnings;
use Data::Dumper;

=head1 GOAL

two arrays ['a','b','c'] and ['x','y','z'] 
become a hash:

  { a => ['a','b','c']
  , b => ['a','b','c']
  , c => ['a','b','c']
  , x => ['x','y','z']
  , y => ['x','y','z']
  , z => ['x','y','z']
  }

=cut

print Dumper({ map{my $a=$_;map{$_=>$a} @$a} [qw{a b c}], [qw{x y z}] });
__END__
$VAR1 = {
          'y' => [
                   'x',
                   'y',
                   'z'
                 ],
          'c' => [
                   'a',
                   'b',
                   'c'
                 ],
          'a' => $VAR1->{'c'},
          'b' => $VAR1->{'c'},
          'x' => $VAR1->{'y'},
          'z' => $VAR1->{'y'}
        };

[%w[a b c], %w[x y z]].inject({}) do |h,ary|
  ary.inject(h) do |h,x|
    h.merge(x => ary)
  end
end

Ahhh... so extra steps are required! Awesome thanks.