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Name,Type,Age
Lily,Cat,4
Buster,Dog,5
Tweety,Bird,2

use strict;
use warnings;
...
     return $result[$row_num - 1];  # -1 since array indexes are 0-bas
+ed,
                                    # and we count our lines 1-based
}

use strict;
use warnings;
...

    return $all->[0]->{$field_name}
}

The animal in line 2 is 4 years old.
The critter in line 4 is called Tweety.