TIMTOWTDI
I'm also showing the classic hard-coded approach with nested loops and auto-vivification for comparison.
use strict;
use warnings;
use Data::Dump qw/pp dd/;
use Test::More;
sub matrix (&@){
my $code = shift;
my $rec;
my @coor;
my $idx;
$rec = sub {
my $level = shift;
return $code->(@coor) unless @_;
my $max = shift;
my $arr = [
map {
$coor[$level] = $_;
$rec->($level+1,@_)
} 0 .. $max
];
return $arr;
};
$rec->(0,@_);
}
my $a_matrix = matrix {"<@_>"} 3,2,1;
my @classic;
for my $x (0..3) {
for my $y (0..2) {
for my $z (0..1) {
$classic[$x][$y][$z] = "<$x $y $z>";
}
}
}
#pp \@classic;
is_deeply($a_matrix,\@classic,"same matrix");
pp $a_matrix;
done_testing;
ok 1 - same matrix
[
[
["<0 0 0>", "<0 0 1>"],
["<0 1 0>", "<0 1 1>"],
["<0 2 0>", "<0 2 1>"],
],
[
["<1 0 0>", "<1 0 1>"],
["<1 1 0>", "<1 1 1>"],
["<1 2 0>", "<1 2 1>"],
],
[
["<2 0 0>", "<2 0 1>"],
["<2 1 0>", "<2 1 1>"],
["<2 2 0>", "<2 2 1>"],
],
[
["<3 0 0>", "<3 0 1>"],
["<3 1 0>", "<3 1 1>"],
["<3 2 0>", "<3 2 1>"],
],
]
1..1
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