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#! perl -slw
use strict;
...
nFor {
    print join '', @digits[ @_ ];
} ( 3 ) x 4;

apple, dog, 1
apple, dog, 2
...
tomato, platypus, 1
tomato, platypus, 2
tomato, platypus, III

# Variable number of lists of variable length
my @lists = (
...
   [qw( dog cat platypus )],
   [qw( 1 2 III )],
);

local $, = ", ";
local $\ = "\n";
NestedLoops(\@lists, sub { print @_ });

local $, = ", ";
local $\ = "\n";
nFor { print map $lists[$_][ $_[$_] ], 0..$#_; } map 0+@$_, @lists;

sub nested(&@) {
    my $cb = shift;
...
local $, = ", ";
local $\ = "\n";
nested { print @_; } @lists;