in reply to stack array to array of arrays

Just for fun

perl -MData::Dumper -lE "@r=(1..40);$s=5;$n[($i-$i%$s)/$s][$i++%$s]=$r[$i]for@r;say Dumper\@n

Cheers,
R.

Pereant, qui ante nos nostra dixerunt!

In Section Seekers of Perl Wisdom