comment on

Have a look at Hash::Merge.

Here's a quick hack. I don't understand why you'd want arrays of single-key hashes (but that's what arrayify_hashes() does).

use Data::Dumper;
$Data::Dumper::Indent = 1;

use Hash::Merge qw(merge);

my @hashes = (
    { '999' => { '998' => [ '908', '906', '0', '998', '907' ] } },
    { '999' => { '991' => [ '913', '920', '918', '998', '916', '919', 
+'917', '915', '912', '914' ] } },
    { '999' => { '996' => [] } },
    { '999' => { '995' => [] } },
    { '999' => { '994' => [] } },
    { '999' => { '993' => [] } },
    { '999' => { '997' => [ '986', '987', '990', '984', '989', '988' ]
+ } },
    { '995' => { '101' => [] } },
    { '995' => { '102' => [] } },
    { '995' => { '103' => [] } },
    { '995' => { '104' => [] } },
    { '995' => { '105' => [] } },
    { '995' => { '106' => [] } },
    { '995' => { '107' => [] } },
    { '994' => { '910' => [] } },
    { '993' => { '909' => [] } },
    { '993' => { '904' => [] } },
    { '994' => { '985' => [] } },
    { '994' => { '983' => [] } },
    { '993' => { '902' => [] } },
    { '999' => { '992' => [ '905' ] } },
);

sub arrayify_hashes {
    my ($hash) = @_;

    my @mapped;

    while (my ($key, $value) = each %{ $hash })
    {
        push @mapped, { $key => ref($value) eq "HASH"
          ? arrayify_hashes($value)
          : $value
        };
    }

    return \@mapped;
}

my $merged = pop(@hashes);

for my $hash (@hashes)
{
    $merged = merge($merged, $hash);
}

print Dumper arrayify_hashes($merged);
[download]

Output:

$VAR1 = [
  {
    '993' => [
      {
        '902' => []
      },
      {
        '904' => []
      },
      {
        '909' => []
      }
    ]
  },
  {
    '994' => [
      {
        '910' => []
      },
      {
        '985' => []
      },
      {
        '983' => []
      }
    ]
  },
  {
    '999' => [
      {
        '993' => []
      },
      {
        '994' => []
      },
      {
        '992' => [
          '905'
        ]
      },
      {
        '998' => [
          '908',
          '906',
          '0',
          '998',
          '907'
        ]
      },
      {
        '996' => []
      },
      {
        '997' => [
          '986',
          '987',
          '990',
          '984',
          '989',
          '988'
        ]
      },
      {
        '995' => []
      },
      {
        '991' => [
          '913',
          '920',
          '918',
          '998',
          '916',
          '919',
          '917',
          '915',
          '912',
          '914'
        ]
      }
    ]
  },
  {
    '995' => [
      {
        '104' => []
      },
      {
        '103' => []
      },
      {
        '106' => []
      },
      {
        '102' => []
      },
      {
        '101' => []
      },
      {
        '105' => []
      },
      {
        '107' => []
      }
    ]
  }
];
[download]

In reply to Re: Creating a tree-based hash out of hashes by repellent
in thread Creating a tree-based hash out of hashes by Anonymous Monk

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