On 7/18/07, Arie Groeneveld <[EMAIL PROTECTED]> wrote:
Ok, so when do I use nub instead of 'map head.group.sort' ?
Using nub gave me a lot of trouble in terms of time consumption
while handling long lists.
Well, nub is non-strict, so you can use it on infinite or partial
lists, provided you don't consume too much of the result.
e.g.
Prelude Data.List> take 10 $ nub [1..]
[1,2,3,4,5,6,7,8,9,10]
Prelude Data.List> take 10 $ map head . group . sort $ [1..]
Interrupted.
(Yes, taking nub of [1..] is silly; it's just an example.)
Stuart
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