Chaddaï Fouché wrote:
Another possibility would be a space delimited number list, easier for your users to remember :
parseWordList :: (Read a) => String -> [a] parseWordList str = map read . words $ str
Even nicer, here is a function that will allow the user to enter a "list of numbers" in any reasonable format. If the input doesn't make sense as a "list of numbers", the empty list is returned: parseWordList :: (Read a) => String -> [a] parseWordList = unfoldr $ listToMaybe . concatMap reads . tails You'll need to import the Data.List and Data.Maybe libraries for this. Here is a snippet from a GHCi session that illustrates its use: Prelude Data.List Data.Maybe> parseWordList "The numbers are 34, 56, and 22." :: [Int] [34,56,22] Regards, Yitz