Hint: Move the boundary case outside the comprehension, and then use
the comprehension to handle the normal case.
Also, FYI, a comprehension feeds each value of the list xs into x, and
then evaluates the expression to the left of the pipe with that single
value of x.
Cheers,
Greg
On Oct 7, 2009, at 1:48 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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