Iterating Blessed Array of Array

neversaint has asked for the wisdom of the Perl Monks concerning the following question:

Dear Masters,
I have the following function:

my @output = myfunc("data_value1");
print Dumper \@output;
[download]

that yields:

$VAR1 = [
          bless( {
                   'ID' => 'WBGene00000099',
                   'DBConnection' => bless( {
                                   'database' => 'treefam_6',
                         'database_handle' => bless( {}, 'DBI::db' )
                               }, 'Treefam::DBConnection' ),
                   'species' => 'Caenorhabditis elegans',
                   'bootstrap' => '19',
                   'species_name_type' => 'LATIN'
                 }, 'Treefam::Gene' ),
          bless( {
                   'ID' => 'WBGene00000098',
                   'DBConnection' => $VAR1->[0]{'DBConnection'},
                   'species' => 'Caenorhabditis elegans',
                   'bootstrap' => '1',
                   'species_name_type' => 'LATIN'
                 }, 'Treefam::Gene' ),
          bless( {
                   'ID' => 'YPL209C',
                   'DBConnection' => $VAR1->[0]{'DBConnection'},
                   'species' => 'Saccharomyces cerevisiae',
                   'bootstrap' => '47',
                   'species_name_type' => 'LATIN'
                 }, 'Treefam::Gene' )
        ];
[download]

My question is how can iterate/print such data structure so that I can get the output like this:

WBGene00000099 - Caenorhabditis elegans
WBGene00000098 - Caenorhabditis elegans
YPL209C - Saccharomyces cerevisiae
[download]

namely from "ID" and "species" keys.

---
neversaint and everlastingly indebted.......

Comment on Iterating Blessed Array of Array Select or Download Code

Replies are listed 'Best First'.
Re: Iterating Blessed Array of Array by moritz (Cardinal) on Dec 06, 2008 at 15:37 UTC
Contrary to what your title says, neither is the array blessed, nor does it contain arrays. Actually it's a simple, unblessed array that contains blessed hash references. You can iterate over that array just like you'd do with any other array: `for my $item (@output) { print $item->{ID}, ' ', $item->{species}, "\n"; }` [download] But usually it's bad practice to access the hash items of an object - most of the time the object provides accessor methods that you should use instead.	[reply] [d/l]
Re^2: Iterating Blessed Array of Array by oeuftete (Monk) on Dec 06, 2008 at 16:33 UTC
And there are accessors, which it only took a very quick googling to find. So you could use the accessor `$item->ID` instead of directly accessing the hash with `$item->{ID}`.	[reply] [d/l] [select]