comment on

I have a (small) dataset in a array of hashes, like this:

@AoH = ( 
    {
          'targetL' => 'foisonnement',
          'origin' => 'AMG',
          'count' => '1',
        },
    {
          'targetL' => 'foisonnement',
          'origin' => 'IDBR',
          'count' => '1',
        },
    {
          'origin' => 'IWWF',
          'targetL' => 'gonfler',
          'count' => '1',
        },
    {
          'origin' => 'IWWF',
          'targetL' => 'due',
          'count' => '1',
        },
    {
          'origin' => 'IWWF',
          'targetL' => 'due',
          'count' => '1',
        },
);
[download]

I need to 'merge' the hashes that have the same value in key 'targetL' and keep the count of how many of them have been merged, incrementing the 'count' value. Plus, the 'origin' keys of the merged hashes should be concatenated. With the above input I need to get:

@AoHfinal = ( 
    {
          'targetL' => 'foisonnement',
          'origin' => 'AMG IDBR',
          'count' => '2',
        },
    {
          'origin' => 'IWWF',
          'targetL' => 'gonfler',
          'count' => '1',
        },
    {
          'origin' => 'IWWF',
          'targetL' => 'due',
          'count' => '2',
        },
);
[download]

I am quite new to Perl. I came out with a very bulky solution with too many loops and recreation of intermediate array of hashes. But, as far I can see, this is something that should be done in a few lines of code. In which direction should I move?

In reply to Counting elements in array of cases by Anonymous Monk

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