Here are two that I like. The first fills unused subarray elements with undef. 
sub groups_of_n
{
  my $n = shift;
  return map { [@_[$_*$n..$_*$n+$n-1]] } 0..$#_/$n;
}


use POSIX qw(ceil);

sub groups_of_n
{
  my $n = shift;
  my $m = ceil(@_/$n);
  my @r;
  my $i = 0;
  push(@{$r[$i++%$m]},$_) foreach @_;
  @r;
}

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sgifford's Web page

In reply to Re: Syntactically cool list of lists by sgifford
in thread Syntactically cool list of lists by jettero

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