Hi Alex, I suggest you try haskell-cafe@haskell.org, its a much better place to ask these sorts of Haskell style questions. The answer is to use an "if" expression somewhere, I'll leave you to figure out where :) Thanks Neil On 10/19/06, Alex Teslin wrote:

Hi, I am a newbie in Haskell and have some problem of defining a function that would convert all small letters to capital and leave the rest intact. I have managed to do with two functions:

capitalise :: String -> String capitalise xs = [capitalise2 ch| ch<-xs]

capitalise2 :: Char -> Char capitalise2 ch | isLower ch = chr (ord ch - 32) | otherwise = ch

But in the book exercise it asks to define as a single function. I tried like this:

capitalise :: String -> String capitalise xs = [chr (ord ch - 32) | ch<-xs, isLower ch]

But this returns only converted characters, the rest is ignored.

Any help would be much appriciated.

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