All,
I was rather disappointed at the turnout of Perl6 Contest: Test your Skills. After reading Why aren't you using Perl 6 yet?, I realize there are a lot of good reasons. OTOH, silly exercises to demonstrate skill have never been frowned upon here, so I will continue to poke and prod people to show off their Perl6 knowledge.

I finally figured out how to do arbitrarily nested loops, something tye figured out a long time ago. My problem is that I think in p5 so my p6 code as a result doesn't look very p6ish. The challenge is to achieve the same functionality as clearly and concisely as possible with an emphasis on p6 features. 

use v6;

sub NestedLoop (++@loop, +%opt, +$code) returns Ref{
    my @pos = 0 xx (@loop.elems - 1), -1;
    return sub {
        if ++@pos[-1] > @loop[-1].end {
            for reverse 0 .. @pos.end - 1 -> $i {
                next if @pos[$i] == @loop[$i].end;
                ++@pos[$i];
                @pos = (@pos[0..$i], 0 xx (@pos.end - $i)) and last;
            }
        }
        return () if @pos[-1] > @loop[-1].end;
        return map -> $i { @loop[$i][@pos[$i]] } 0 .. @pos.end;
    };
};

my $next = NestedLoop(loop => ([0..2], [0..2], [0..2]));
my @group;
while @group = $next() { say ~@group; }

[download]

Cheers - L~R

Note: This code is functional but is currently lacking support for the optional parameters. They may be added later in a reply.

Update: See Pugs Examples for the latest

In reply to Perl6 Contest #2: P6 That Doesn't Look Like P5 by Limbic~Region

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