[Haskell-cafe] isSpace

Stefan O'Rear stefanor at cox.net
Tue Dec 4 16:57:59 EST 2007

On Tue, Dec 04, 2007 at 05:13:19PM +0000, Ryan Bloor wrote:
> hi
> I am having trouble with a function that is supposed to eliminate spaces from the start of a String and return the resulting string. I reckon a dropWhile could be used but the isSpace bit is causing me problems...
> words :: String -> String
> words a = case dropWhile isSpace a of
>                      "" -> 
>                      s:ss -> (s:word) : words rest
>                                    where (word,rest) = break isSpace ss

You might want to write the code for the first case; an expression is
mandatory after ->.

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