I don't think a list comprehension is the easiest way to do it, how about upperCase :: String -> String upperCase [] = [] upperCase (x:xs) = toUpper x : map toLower xs -Ross On Oct 7, 2009, at 4:48 PM, Steven1990 wrote:
Hi, I'm currently learning Haskell, and I've been trying to work out a function for the following problem for a couple of days now.
I want to use a list comprehension method to change the first letter of a string to upper case, and the rest of the string to lower case.
Eg: "heLLo" -> "Hello"
As I'm trying to learn this, I would appreciate hints rather than the explicit solution if possible? I'm sure I'm close to a solution, I must be missing something though. Driving me crazy!
My attempts are something similar to this:
upperCase :: String -> String upperCase xs = [toUpper(x):toLower(xs) | x <- xs]
I think 'toLower' expects a single character rather than the list which is one place I'm going wrong?
Thanks in advance, Steven -- View this message in context: http://www.nabble.com/New-to-Haskell---List-Comprehension-Question-tp2579414... Sent from the Haskell - Haskell-Cafe mailing list archive at Nabble.com .
_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe