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  1. or download this
    # $artfList - a hash reference

...
    my $category = $row_object->getCategory;
    print "ID: $id, Category: $category\n"; 
}
  2. or download this
    my @ids;
for my $row_object (@$array) {
    push( @ids, $row_object->getId );
}
  3. or download this
    my @ids = map { $_->getId } @{ $artfList->{dataRows} };