I have two array of hashes that have a key value that is the same between them. They key value is 'location_id'. I want to match these arrays of hashes against the key value and return the 'id' value of one of the hashes if it matches. I currently have working code, but I do not think it is correct or the fastest way to accomplish this. Example: 

@subnets = {
              {
                 'id' => '1',
                 'location_id' => '30',
                 'subnet' => '255.255.255.0'
               },
                             {
                 'id' => '2',
                 'location_id' => '13',
                 'subnet' => '255.255.254.0'
               },
              {
                 'id' => '3',
                 'location_id' => '19',
                 'subnet' => '255.255.0.0'
               },
          };

@filers_info = {
                 {
                   'id' => '1',
                   'location_id => '19',
                   'info' => 'blah1',
                 },
                 {
                   'id' => '2',
                   'location_id => '30',
                   'info' => 'blah1',
                 },
            };
foreach my $subnet (@subnets) {
   my @found_filers = grep { $_->{'location_id'} == $subnet->{'locatio
+n_id'} } @filers_info;
  push @total_filers, @found_filers;
        }
@filer_ids = map{$_->{'id'} } @total_filers;

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This does work as expected, but I don't think it's fast enough. In the real world @subnets contains over 100,000 records and @filers_info has around 2000. This looping through the @subnets array takes quite a while. I'm looking for a method to possibly speed this code up without using any external modules. Thanks!

In reply to Matching values between two arrays of hashes. by tacoking92

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