I have written up the beginnings of some code to get Yahoo Finance quotes, too. Perhaps we should compare notes, and try to put something together that uses the best ideas from each attempt? Aaron On Jul 11, 2007, at 12:57 PM, brad clawsie wrote:
i am working on improving a module for getting Yahoo Finance quote data, hopefully getting it to a point that i can put it on hackage
in the quote retrieval function, there are a few places i would like to call out errors. in a trivial case i could return
IO (Maybe String)
with Nothing signifying any error state, or Just expressing the data
but i would like to be able to express some of these error cases in a more structured manner
i know the Either type can be used in such a case(?), but i've had some problem locating a satisfactory example (if this is indeed appropriate)
could one of the vets here provide a simplistic example expressing error cases, preferrably in the IO Monad (in case there are any gotchas there)?
thanks so much! brad _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe