Just for fun...
#!/usr/bin/perl
use strict; # https://perlmonks.org/?node_id=11125178
use warnings;
my @list = 1 .. 12;
my @AoA = [];
my $C = 4;
push @{ @{ $AoA[-1] } < $C ? $AoA[-1] : \@AoA },
@{ $AoA[-1] } < $C ? $_ : [ $_ ] for @list;
use Data::Dump 'dd'; dd \@list; dd \@AoA;
Outputs:
[1 .. 12]
[[1 .. 4], [5 .. 8], [9 .. 12]]
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