[Haskell-cafe] New to Haskell - List Comprehension Question

[Ross Mellgren]

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
> -- 
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