Let's go functional in Perl! (Tests included).
#!/usr/bin/perl use warnings; use strict; use Test::More; sub diamond { my ($n) = @_; return if $n < 1 or 0 == $n % 2; return join "\n", map { ' ' x (($n - $_) / 2) . '*' x $_ } grep $_ % 2, 1 .. $n, reverse 1 .. $n - 1 } is diamond(0), undef; is diamond(1), "*"; is diamond(2), undef; is diamond(3), " *\n***\n *"; is diamond(5), " *\n ***\n*****\n ***\n *"; done_testing();
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Let's go functional in Perl! (Tests included).