monads

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Is there a `replicateM` function for the internal monad in a monad transformer?

Suppose I have something like this: data Environment = ... data MyState = ...开发者_如何学C data Report= ...[详细]

2023-02-17 18:02 分类：问答
How to use (->) instances of Monad and confusion about (->)

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.[详细]

2023-02-17 01:53 分类：问答
Monadic type confusion

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:[详细]

2023-02-16 21:55 分类：问答
Why does application of `sequence` on List of Lists lead to computation of its Cartesian Product?

My question is about the sequence function in Prelude, the signature of which is as follows: sequence :: Monad m => [m a] -> m [a][详细]

2023-02-16 21:31 分类：问答
How to create a Haskell function that turns IO String into IO [String]?

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.[详细]

2023-02-16 01:20 分类：问答
Why changing the Data.Binary.Put monad into a transformer creates a memory leak?

I\'m trying to modify the Data.Binary.PutM monad into a monad transformer. So I started by changin it\'s definition from[详细]

2023-02-15 22:12 分类：问答
Haskell Inserstion sort count

My problem is to turn this: iSort :: Ord a => [a] -> [a] iSort [] = [] iSort (x:xs) = ins x (iSort xs)[详细]

2023-02-15 20:56 分类：问答
Eliminating my explicit state passing via like, monads and stuff

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,[详细]

2023-02-14 10:55 分类：问答
Is there no standard (Either a) monad instance?

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[详细]

2023-02-13 02:51 分类：问答
Designing a monadic type

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[详细]

2023-02-11 18:37 分类：问答