On Sun, Apr 19, 2009 at 9:48 AM, Manlio Perillo
Henning Thielemann ha scritto:
On Tue, 14 Apr 2009, rodrigo.bonifacio wrote:
I guess this is a very simple question. How can I convert IO [XmlTree] to just a list of XmlTree?
The old Wiki had: http://www.haskell.org/wikisnapshot/ThatAnnoyingIoType.html
Should be ported to the new Wiki since it is a FAQ ...
Note that it is not always possible to separate IO from pure code. As an example, consider an HTTP 1.1 server that read a request body containing a number for each line, and return a response body containing the sum of the numbers.
What? sumRequest :: String -> String -- strips header, sums numbers, returns response sumServer :: IO () -- reads from socket, writes sumRequest to socket And many other permutations, with differing degrees of laziness and parametericity. Luke