Re: recursively reduce an array

[johngg]

If you are sorting on values, do you mean something like this?

use strict;
use warnings;

use feature qw{ say };

sub groupsOf (&$@);

my %hash = map { $_ => int rand 50 } q{a} .. q{z};

say qq{$_\n-----}
   for groupsOf { join qq{\n}, map { qq{$_ => $hash{ $_ }} } @_ }
   10,
   sort { $hash{ $a } <=> $hash{ $b } } keys %hash;

sub groupsOf (&$@)
{
    my $rcToRun  = shift;
    my $groupsOf = shift;

    my $rcDoIt;
    $rcDoIt = sub
       {
           $rcToRun->(
              map shift, 1 .. ( @_ < $groupsOf ? @_ : $groupsOf )
              ),
           @_ ? &$rcDoIt : ();
       };

    &$rcDoIt;
}

The output.

$ ./spw1002389
n => 0
t => 2
w => 5
g => 8
d => 16
b => 16
c => 18
j => 20
o => 22
h => 23
-----
y => 25
k => 28
i => 29
q => 29
s => 30
x => 31
u => 34
l => 34
p => 34
m => 36
-----
f => 38
v => 38
r => 43
a => 43
e => 49
z => 49
-----
$

I hope this is heading in the right direction but please ask further if we have misunderstood your problem.