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Mastering Modern Perl: Writing Efficient and Maintainable Code

Solution Review: Exception Handling

Explore how to properly handle exceptions in Perl by using die to throw errors and eval to catch them. Understand best practices for writing clear and maintainable error handling that enhances your Perl code quality and reliability.

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Solution

Let’s look at the solution first before jumping into the explanation:

Perl
sub divide {
    my ($numerator, $denominator) = @_;
    if (!defined $numerator || !defined $denominator) {
        die "One or both arguments are undefined";
    } elsif ($denominator == 0) {
        die "Division by zero";
    }
    
    return $numerator / $denominator;
}
my $result = eval { divide($number1, $number2) };
if (my $exception = $@) {
    say "Error: $exception";
} else {
    say "Result: $result";
}

Explanation

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