OK, let me try again, I have a data structure like this: 
my $data = [
   {
 
     'type' => 'Paper'
   },
   {

     'type' => 'Paper'
   },
   {

     'type' => 'Plastic'
   },   {

     'type' => 'Plastic'
   },   {

     'type' => 'Plastic'
   },   {

     'type' => 'Plastic'
   },
   {

     'type' => 'Cotton'
   },
   {

     'type' => 'Cotton'
   },
   {

     'type' => 'Cotton'
   },
   {

     'type' => 'Cotton'
   },
   {

     'type' => 'Cotton'
   },
{

     'type' => 'Paper'
   },
{

     'type' => 'Paper'
   },
{

     'type' => 'Paper'
   },
{

     'type' => 'Paper'
   },
{

     'type' => 'Paper'
   },

];

[download]
I need to process this array and filter out the duplicated ones: 
my $res;

 for my $entry (@$data) {
     
     #$entry->{type} = [] unless exists $entry->{type};

     push @$res, $res{$entry->{type}};
   
 }
print Dumper @$res;

[download]
I just cant get it to work.

In reply to Re^4: Get just the unique value by Anonymous Monk
in thread Get just the unique value by Anonymous Monk

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