#!/usr/bin/perl

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

my @arr1 = (1,2,3,4);
my @arr2 = ();

my $arr_ref1 = [11,22,33,44];
my $arr_ref2 = [];

# The last scalar ($VAR8 when printed) does not exist so will return 'undef'
print Dumper( 
        @arr1, 
        @arr2, 
        $arr_ref1, 
        $arr_ref2,
        $$arr_ref1[0], 
        $$arr_ref2[1]
        );
__END__

# RETURNS
$VAR1 = 1;
$VAR2 = 2;
$VAR3 = 3;
$VAR4 = 4;
$VAR5 = [
          11,
          22,
          33,
          44
        ];
$VAR6 = [];
$VAR7 = 11;
$VAR8 = undef;