Hi Monks. I am a very new to hashes in Perl. In the following code, I am creating a hash of hashes of arrays.

#!/usr/bin/perl

use strict;
use warnings;

use Data::Dumper;

my @array1 = (
  "hello",
  "world"
);

my @array2 = (
  "here"
);

my @array3 = (
  "there"
);

my %inner_hash = (
  innerkey1 => \@array1,
  innerkey2 => \@array2,
  innerkey3 => \@array3
);

my %hash_of_hash_of_arrays = (
  key => \%inner_hash
);

print Dumper(\%hash_of_hash_of_arrays);

exit(0);
[download]

This gives the output:

$VAR1 = {
          'key' => {
                     'innerkey2' => [
                                      'here'
                                    ],
                     'innerkey3' => [
                                      'there'
                                    ],
                     'innerkey1' => [
                                      'hello',
                                      'world'
                                    ]
                   }
        };
[download]

Is there any way I can get this same output by defining only one variable? Something like:

my %hash_of_hash_of_arrays = {
           'key' => {
                      'innerkey2' => [
                                       'here'
                                     ],
                      'innerkey3' => [
                                       'there'
                                     ],
                      'innerkey1' => [
                                       'hello',
                                       'world'
                                     ]
                    }
         };
[download]

...but that gives an error about "Reference found where even-sized list expected", and the output looks like:

$VAR1 = {
          'HASH(0x57e1d78)' => undef
        };
[download]

which obviously is not what I want at all. Please help.

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