note ioannis Instead of using the <b>x</b> operator, we could have used the the <b>&&</b> operator. The advantage here is that it codes simpler, and the disadvantage is it has no movable parts (since it is not an array). <code> no strict; no warnings; my $part = 'http://example.net/app' . ($admin && $is_admin_link) . (defined $subsite && $subsite) . $mode . (defined $id && $id) . (defined $submode && $submode) ; print $part; </code> 564792 564792