The state monad \"interface\" class MonadState s m where get :: m s put :: s -> m () (+ return and bind) allows to construc开发者_运维知识库t any possible computation with State monad without us
I\'ve just wrapped my head around monads (at least I\'d like to think I have) and more specifically the state monad, which some people that are way smarter then me figured out, so I\'m probably way of
instance Monad (Either a) where return = Left fail = Right Left x >>= f = f x Right x >>= _ = Right x
I\'m reading the Monads chapter in Real World Haskell (chapter 14). A function is defined as follows: type RandomState a = State StdGen a
is there a difference like that from IO String to String i 开发者_JS百科want to take some String values from a IO.
Could anyone give some pointers on why the impure开发者_如何学JAVA computations in Haskell are modelled as monads?
usual wxHaskell program looks like main = do run gui gui = do .... .... gui must have type IO a, run has type IO a -> IO (), also there is some initialization routines in run.
Haskell is about computation by calculation of values. DisplayLists / FBOs / VBOs are very very stateful by nature. I.e. \"give me a display list /开发者_运维问答 buffer object\".
Continuing quest to make sense of ContT and friends. Please consider the (absurd but illustrative) code below:
I have a monadic function getRate: getRate :: String -> 开发者_运维问答IO Double I\'d like to map this function over a list of String\'s.Normally, I would just do:
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