use strict; #Always
use Dumpvalue;

###just an example of nested data
my @example = (
{'firstname'=>'Justin', 'lastname'=>'Tyme', 'Age'=>'21'},
{'firstname'=>'Ima', 'lastname'=>'Geek','Age'=>'21'}
);

dump_ref(\@example);###you need to pass a reference to your data since the dumpValues method only takes references.

sub dump_ref
{
   my $ref = shift;
   my $dumper = new Dumpvalue;
   $dumper->dumpValues($ref);
}
___OUTPUT___
0  ARRAY(0x80628f0)
   0  HASH(0x804c8d4)
      'Age' => 21
      'firstname' => 'Justin'
      'lastname' => 'Tyme'
   1  HASH(0x80628b4)
      'Age' => 21
      'firstname' => 'Ima'
      'lastname' => 'Geek'

##</code><code>##

$example[1]->{firstname};

##</code><code>##

my @first_elm_keys = keys %{$example[0]};