On 03/26/2012 05:50 PM, Johan Tibell wrote:
Normalization isn't quite enough unfortunately, as it does solve e.g.
upcase = map toUppper
You need all-at-once functions on strings (which we could add.) I'm just pointing out that most (all?) list functions do the wrong thing when used on Strings.
Hm, do you have any other examples besides toUpper/toLower? Also, that example is not really an argument against using list functions on strings (which, by any reasonable definition, seem to be "sequences of characters" -- whether that sequence is represented as a list, an array, or something else, seems more like an implementation detail to me). Rather, it indicates the fact that Char.toUpper may have to wrong type. If its type was Char -> String instead of Char -> Char, it could handle things like toUppper 'ß' == "SS" correctly. Then stuff like upcase = concatMap toUppper would work fine. As it is, the problem seems to be with Char, not with [Char]. Best regards Christian -- |------- Dr. Christian Siefkes ------- christian@siefkes.net ------- | Homepage: http://www.siefkes.net/ | Blog: http://www.keimform.de/ | Peer Production Everywhere: http://peerconomy.org/wiki/ |---------------------------------- OpenPGP Key ID: 0x346452D8 -- Failure is just success rounded down. -- Ryan North