snippet merlyn Schwartzian transform sort map OK - gotta add it, because I can. {grin} <p> For a complete description of the steps, see [http://www.stonehenge.com/merlyn/UnixReview/col06.html|my column on sorting]. <CODE> my @output = map { $_->[0] } sort { $a->[1] cmp $b->[1] } map { [$_, expensive_func($_)] } @input; </CODE>