... Iterator over a list . ... Returns false when the iterator is exhausted. my $it = new TWiki::ListIterator(\@list); while ($it->hasNext()) { .. ... The iterator object can be customised to pre- and post-process entries from the list before returning them. ... For example, my @list = ( 1, 2, 3 ); my $it = new TWiki::ListIterator(\@list); $it->{filter} = sub { return $_[0] != 2 }; $it->{process} = sub { return $_[0] + 1 }; while ($it->hasNext()) { my $x = $it->next(); print "$x, "; } will print 2, 4 . ...