my $HHs=[ {Rx => 'test', key2 => '1st second key' }, {Rx => '2nd1', key2 => '2nd second key' }, {Rx => '3rd1', key2 => '3rd second key' } ];
say join(', ', @{$HHs->{Rx}}); # say all the values of the 'Rx' key in each element of @$HHs.
Is there an easy way to do what I want here?