Data::Dumper can be used to do a lot of interesting things, but basically, you just need to use Data::Dumper and then print Dumper (anything).

It can be useful to pass a reference to the object you want to see, not just this object. For example, it's useful in case of AoH (array of hashes):

use Data::Dumper;
my @hashes = (
 { one => 1, two => 2, three => 3 },
 { one => 11, two => 22, three => 33 },
);                             
                               
print Dumper @hashes;          
print "-"x5,"\n";
print Dumper \@hashes;         
__END__
$VAR1 = {                      
          'three' => 3,        
          'one' => 1,          
          'two' => 2           
        };                     
$VAR2 = {                      
          'three' => 33,       
          'one' => 11,         
          'two' => 22          
        };                     
-----
$VAR1 = [                      
          {                    
            'three' => 3,      
            'one' => 1,        
            'two' => 2         
          },                   
          {                    
            'three' => 33,     
            'one' => 11,       
            'two' => 22        
          }                    
        ];
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...but it does not improve anything in case of reference to array of references to arrays:

my $reference = [              
 [ 7, 8, 9 ],
 [ 10, 11, 12 ],
];
print Dumper $reference;
print Dumper \$reference;
$VAR1 = [ 
          [ 
            7,
            8,
            9
          ],
          [ 
            10,
            11,
            12
          ]
        ];
$VAR1 = \[  
            [ 
              7,
              8,
              9
            ],
            [ 
              10,
              11,
              12
            ]
          ];
[download]