[Haskell-beginners] string instead of char

[John Moore]

Hi,
    I am now writing a function that replaces vowels with the letter x.
eg.put in a string "help" and out comes hxlp.
I tried this:

f x = case x of

      {'a' -> 'x';'e' -> 'x';'i' -> 'x';'o' -> 'x';'u' -> 'x';_ -> x}

but this wont work on strings, only on the individual letters. Any direction
would be very welcome.

Yours

john
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