Suppose I have something like this: data Environment = ... data MyState = ...开发者_如何学C data Report= ...
At different questions I\'ve found hints in comments concerning using the (->) instance of Monads e.g. 开发者_StackOverflowfor realizing point-free style.
I am going through Write Yourself a Scheme in Haskell.Its a great tutorial, but I\'ve run into a wall with one of the parsing exercises:
My question is about the sequence function in Prelude, the signature of which is as follows: sequence :: Monad m => [m a] -> m [a]
I\'ve started to learn Haskell and feeling overwhelmed with it. I\'m now trying to create a function that either returns a string from standard input or from the contents of a list of files.
I\'m trying to modify the Data.Binary.PutM monad into a monad transformer. So I started by changin it\'s definition from
My problem is to turn this: iSort :: Ord a => [a] -> [a] iSort [] = [] iSort (x:xs) = ins x (iSort xs)
I\'m working through the book Land of Lisp in F# (yeah weird, I know). For their first example text adventure, they make use of global variable mutation and I\'d like to avoid it. My monad-fu is weak,
I was under the impression that there was an instance for Either a somewhere, but I can\'t seem to find it. I have tried importing Control.Monad, Control.Monad.Instances and Data.Either as shown
I\'d need some help to design a monadic datatype, I seem to have trouble wrapping my head around the idea, but I pretty definitely know what I want. Only the type checker seems to require some persuad
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