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Mastering Modern Perl: Writing Efficient and Maintainable Code

Solution: Sum All Elements of a Nested Array

Explore how to sum all elements within nested arrays in Perl using references and packages. This lesson guides you through writing clear, maintainable code by employing nested loops for array traversal and understanding key data structures and organization in Perl.

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Solution

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

Perl
# @nested_array is already defined.
my $sum = defined;
foreach my $array (@nested_array) {
    $sum = $sum + $_ for @$array;
}
...