Mercurial > urweb

fun sum [fs ::: {Unit}] (fl : folder fs) (x : $(mapU int fs)) =
    foldUR [int] [fn _ => int]
    (fn [nm :: Name] [rest :: {Unit}] [[nm] ~ rest] n acc => n + acc)
    0 [fs] fl x

fun main () = return <xml><body>
  {[sum {}]}<br/>
  {[sum {A = 0, B = 1}]}<br/>
  {[sum {C = 2, D = 3, E = 4}]}
</body></xml>
author	Adam Chlipala <adamc@hcoop.net>
date	Thu, 24 Dec 2009 10:59:35 -0500
parents	669ac5e9a69e
children	8d3aa6c7cee0