Oh wise and knowledgeable monks. I seek your wisdom in this hopefully interesting dilemma (ok, enough of that ...). I'm trying to split an array of hashes by a timestamp within the list using map. So far here is what I have. 
my @prizes = [  {
          'GivenAway' => undef,
          'Breakdown' => '0',
          'Dcode' => '00000',
          'UserId' => '8853',
          'Prize' => '500',
          'Contracts' => [
                           {
                             'Year' => undef,
                             'Make' => undef,
                             'Model' => undef,
                             'Contract' => '1'
                           }
                         ],
          'Type' => 'prizes',
          'Timestamp' => '2005-11-07 11:18:01',
          'WinnerId' => '2026',
          'lineid' => '2026',
          'Count' => '1',
          'Rate' => 'std'
        }];

    my %month = ( '01' => 'January',
                  '02' => 'February',
                  '03' => 'March',
                  '04' => 'April',
                  '05' => 'May',
                  '06' => 'June',
                  '07' => 'July',
                  '08' => 'August',
                  '09' => 'September',
                  '10' => 'October',
                  '11' => 'November',
                  '12' => 'December',
                  );

my @mapped_prizes = map +{ $month{(split(/-| /,$_->{'Timestamp'}))[1]}
+ => $_ } , @prizes;

## Which hopefully yields
'November' => [{
          'GivenAway' => undef,
          'Breakdown' => '0',
          'Dcode' => '00000',
          'UserId' => '8853',
          'Prize' => '500',
          'Contracts' => [
                           {
                             'Year' => undef,
                             'Make' => undef,
                             'Model' => undef,
                             'Contract' => '1'
                           }
                         ],
          'Type' => 'prizes',
          'Timestamp' => '2005-11-07 11:18:01',
          'WinnerId' => '2026',
          'lineid' => '2026',
          'Count' => '1',
          'Rate' => 'std'},
];

[download]
Sorry about the formatting. I did the best I can with the room I had. Hopefully you get the idea of what I wanted to do. I'm not sure if I should use map +{ } or map +( ). In any case, dumping @mapped_prizes only results in confusion as I'm not sure if its doing what I want it to do. With map +{} Dumper() yields 
######MAPPED PRIZES######
$VAR1 = {
          'November' => {
                          'GivenAway' => undef,
                          'Breakdown' => '0',
                          'Dcode' => '00000',
                          'UserId' => '8853',
                          'Prize' => '500',
                          'Contracts' => [
                                           {
                                             'Year' => undef,
                                             'Make' => undef,
                                             'Model' => undef,
                                             'Contract' => '1'
                                           }
                                         ],
                          'Type' => 'prizes',
                          'Timestamp' => '2005-11-07 11:18:01',
                          'WinnerId' => '2026',
                          'lineid' => '2026',
                          'Count' => '1',
                          'Rate' => 'std'
                        }
        };
$VAR2 = {
          'November' => {
                          'GivenAway' => undef,
                          'Breakdown' => '0',
                          'Dcode' => '00000',
                          'UserId' => '8853',
                          'Prize' => '300',
                          'Contracts' => [
                                           {
                                             'Year' => undef,
                                             'Make' => undef,
                                             'Model' => undef,
                                             'Contract' => '100'
                                           }
                                         ],
                          'Type' => 'prizes',
                          'Timestamp' => '2005-11-07 15:06:39',
                          'WinnerId' => '2027',
                          'lineid' => '2027',
                          'Count' => '1',
                          'Rate' => 'std'
                        }
        };

[download]
And with map +() Dumper() yields: 
######MAPPED PRIZES######
$VAR1 = 'November';
$VAR2 = {
          'GivenAway' => undef,
          'Breakdown' => '0',
          'Dcode' => '00000',
          'UserId' => '8853',
          'Prize' => '500',
          'Contracts' => [
                           {
                             'Year' => undef,
                             'Make' => undef,
                             'Model' => undef,
                             'Contract' => '1'
                           }
                         ],
          'Type' => 'prizes',
          'Timestamp' => '2005-11-07 11:18:01',
          'WinnerId' => '2026',
          'lineid' => '2026',
          'Count' => '1',
          'Rate' => 'std'
        };
$VAR3 = 'November';
$VAR4 = {
          'GivenAway' => undef,
          'Breakdown' => '0',
          'Dcode' => '00000',
          'UserId' => '8853',
          'Prize' => '300',
          'Contracts' => [
                           {
                             'Year' => undef,
                             'Make' => undef,
                             'Model' => undef,
                             'Contract' => '100'
                           }
                         ],
          'Type' => 'prizes',
          'Timestamp' => '2005-11-07 15:06:39',
          'WinnerId' => '2027',
          'lineid' => '2027',
          'Count' => '1',
          'Rate' => 'std'
        };

[download]
Clever use of map? Or a clever shot in the foot? My thanks, BMaximus
BMaximus

In reply to Is this a correct use of map? by BMaximus

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