Dumper and sorting of keys

When you use Dumper for debugging via comfortable logging data structures by reference, you can additionally apply sorting to the output. Say, you have a hash addressed by $hash_ref reference. If you need to output the hash contents, but have its keys sorted, you can do:

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1. use strict;  
2. use Data::Dumper;  
3.   
4. $hash_ref = generate your hash here  
5.   
6. $Data::Dumper::Sortkeys = \&my_filter;  
7. print Dumper($hash_ref), "\n";  
8.   
9. sub my_filter {  
10.  my ($hash) = @_;  
11.  # return an array ref containing the hash keys to dump  
12.  # in the order that you want them to be dumped  
13.         return [  
14.             sort {$a <=> $b} keys %$hash  
15.         ];  
16. }  

use strict;
use Data::Dumper;

$hash_ref = generate your hash here

$Data::Dumper::Sortkeys = \&my_filter;
print Dumper($hash_ref), "\n";

sub my_filter {
 my ($hash) = @_;
 # return an array ref containing the hash keys to dump
 # in the order that you want them to be dumped
        return [
            sort {$a <=> $b} keys %$hash
        ];
}