The MaybeT monad. See my-hair.info MaybeT for more widely-used version. Our Functor instance and our implementation. Clean Alternatives with MaybeT. 18 Nov Haskell's abstraction facilities are awesome. Functor, Applicative, and Monad are all great, and Maybe is a pretty. This is available here as my-hair.info file. The MaybeT transformer will allow us to break out of a monad computation much like throwing an exception.
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|Maybet||Failure returns the value Nothingbypassing any bound functions which follow. The errors packages names it hoistMaybe: Consider the MaybeT transformer:. I have skimmed through a few monad transformer tutorials and they all seem to use State Monad or Parsers or something complicated for a newbee. The run function "runs" the top-most layer of a monad stack returning a value from the inside layer. Perhaps we could devise a newtype around IO Maybe a with a bind function that automatically checks if the first argument is a Nothing inside IOsaving us the trouble of checking it. It's instance of MonadPlus reef club casino no deposit bonus of MonadIO.|