Just one point , when using Data::Dumper::Dumper() to dump an array or a hash, it is often better to pass a reference to the hash/array, as the output looks more like the original data structure - and you avoid the copying overhead of call-by-value vs call-by-refernce

use Data::Dumper;
my @array = (1,2,3,4,5,6,7);
print Dumper(\@array);
my %hash;
# below is a hash slice - you should learn about these
@hash{@array} = @array;# a hash whose keys == its values
print Dumper(\%hash);
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results in the output

$VAR1 = [
          1,
          2,
          3,
          4,
          5,
          6,
          7
        ];
$VAR1 = {
          '7' => 7,
          '1' => 1,
          '2' => 2,
          '3' => 3,
          '4' => 4,
          '5' => 5,
          '6' => 6
        };
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which to my eyes seems nicer