8. Error Handling (Chapter 13)

Throw exceptions. Don't return magic values. People don't check them anyway.

croak and carp are useful for throwing exceptions.

For complicated exceptions, use Exception Classes.

Use the standard Fatal module to make the builtins return exceptions; for example:

    use Fatal qw( open close );
    open my $fh, '>', $filename;
    print {$fh} $results;
    close $fh