Tried this for fun. But it becomes slower as bucket count increases:
#!/usr/bin/perl -l
# https://www.perlmonks.org/?node_id=11105885
use strict;
use warnings;
use Data::Dumper;
my @a = 1 .. 14;
my $buckets = 4;
my @buckets;
my $place = ',';
$_ = $place x ( @a + $buckets - 1 );
my $space = $buckets - 1;
my @bucket;
/
(?(?{ $buckets <= pos }) (*ACCEPT) )
(?{ @bucket = (); })
(?: .{$space} $place
(?{ push @bucket, ( pos ) - $buckets })
)++
(?{ push @buckets, [ @a[ @bucket ] ] })
(*FAIL)
/x;
print Dumper( @buckets );
OUTPUT:
$VAR1 = [
1,
5,
9,
13
];
$VAR2 = [
2,
6,
10,
14
];
$VAR3 = [
3,
7,
11
];
$VAR4 = [
4,
8,
12
];