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++ for clever use of glob. It actually performs quite well in this case:

```                   Rate Algorithm::Loops             glob     Nested l
+oops
Algorithm::Loops  371/s               --             -88%
+-91%
glob             3059/s             724%               --
+-27%
Nested loops     4219/s            1036%              38%
+  --
``` #!/usr/bin/env perl

use warnings;
use 5.014;

use Algorithm::Loops qw/NestedLoops/;
use Benchmark qw/:all/;

my @SKU     = (1..5);
my @shirt   = qw/T S L H/;
my @size    = qw/S M L XL 2X/;
my @col     = qw/BLU GRN WHT BLK/;

say scalar algorithm_loops();
say scalar nested_loops();
say scalar do_glob();

cmpthese(-10, {
'Algorithm::Loops' => \&algorithm_loops,
'Nested loops'     => \&nested_loops,
'glob'             => \&do_glob,
});

sub algorithm_loops {
return NestedLoops([ \@SKU, \@shirt, \@size, \@col ],
sub { 'SKU' . join '', @_ });
}

sub nested_loops {
my @r;
for my \$sku (@SKU) {
for my \$shirt (@shirt) {
for my \$size (@size) {
for my \$col (@col) {
push @r, 'SKU'.\$sku.\$shirt.\$size.\$col;
}
}
}
}
return @r;
}

sub do_glob {
() = glob 'SKU{'.join(',',@SKU).'}{'.
join(',',@shirt).'}{'.
join(',',@size).'}{'.
join(',',@col).'}';
}

In reply to Re^2: Multiple Permutation handling by rjt
in thread Multiple Permutation handling by midget2000x

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 [davido]: Lol, in composing test code for Re: Stupid, yet simple, sort question I managed to fill up /tmp for a moment, causing bash to complain about "pmbash: cannot create temp file for here-document: No space left on device" [davido]: hm, sorry, wrong link: Re^3: Perl Program to efficiently process 500000 small files in a Directory (AIX) should be it.

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