perldata monks,

I have

my %in_hash = (
  jibber => [
              {id =>  1, score => 3, name => 'foo'},
              {id =>  5, score => 1, name => 'bar'},
              {id => 22, score => 6, name => 'baz'},
            ],
  jabber => [
              {id =>  3, score => 1, name => 'boo'},
              {id =>  5, score => 3, name => 'bar'},
              {id => 12, score => 2, name => 'zib'},
              {id => 22, score => 2, name => 'baz'},
            ],
);
[download]

and I want

my %out_hash = (
  'jibber jabber' => [
                        {id =>  5, score => 4, name => 'bar'},
                        {id => 22, score => 8, name => 'baz'},
                     ],
  'jibber'        => [
                        {id =>  1, score => 3, name => 'foo'},
                     ],
  'jabber'        => [
                        {id =>  3, score => 1, name => 'boo'},
                        {id => 12, score => 2, name => 'zib'},
                     ],
)
[download]

The %out_hash combines the entries in the incoming so that keys with common ids get their scores summed up, and other keys are left with the non-common id entries.

Monks that might ask what I have done thus far -- to them I spake, nothing more than constructing the above example hashes. Essentially, I am drawing a blank (other than doing some terrible, long-drawn, brute force method the very thought of which numbs me).

Update: Corrected the hash defs as per the most fascinating tlm

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