my @names = qw(A B C D);
my %order = ();
for(my $i=0; $i<4; $i++) {
    $order{$names[$i]} = $names[$i];
}

while ((my $key, my $value) = each(%order)){
     print $key.", ".$value."\n";
}
[download]

Yes, you could do that but a Perl-style loop (see Foreach Loops) might be more idiomatic than a C-style one (For Loops). In fact, for and foreach are synonymous and can both be used interchangeably for either style of loop.

$ perl -Mstrict -Mwarnings -MData::Dumper -E '
> my @names = qw{ A B C D };
> my %order;
> foreach my $name ( @names )
> {
>     $order{ $name } = $name;
> }
> print Data::Dumper->Dumpxs( [ \ %order ], [ qw{ *order } ] );'
%order = (
           'A' => 'A',
           'D' => 'D',
           'C' => 'C',
           'B' => 'B'
         );
$
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Another way to construct the hash would be to use a map instead of the foreach.

$ perl -Mstrict -Mwarnings -MData::Dumper -E '
> my @names = qw{ A B C D };
> my %order = map { $_ => $_ } @names;
> print Data::Dumper->Dumpxs( [ \ %order ], [ qw{ *order } ] );'
%order = (
           'A' => 'A',
           'D' => 'D',
           'C' => 'C',
           'B' => 'B'
         );
$
[download]

I hope this is helpful.

Cheers,

JohnGG

Or even, horrors, a slice:

use Data::Dumper;
my @names = qw/ A B C D /;
my %order;
@order{ @names } = @names;
print Dumper \%order;
__END__
Prints:
$VAR1 = {
          'A' => 'A',
          'D' => 'D',
          'C' => 'C',
          'B' => 'B'
        };
[download]

لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ