This question already has answers here: 开发者_Python百科 Haskell - What is Control.Applicative.Alternative good for?
I want to access type variables in an instance, that don\'t show up in the instance\'s parameters. For example,
Consider the following code, data MyBaseExpr α where ConstE :: Show α => α -> MyBaseExpr α class Monad
When diving deeper into Scala I hit the term type class. It had been confusing because a class is a type and a type could
Consider the next example. I have a monad MyM that is just a StateT {-# LANGUAGE TypeFamilies #-} import Control.Monad.State
I want to write a monad type class which will specify some basic actions for a DSL (domain-specific language) monad.
If I use the + operator, Haskell automatically infers th开发者_Python百科e type class Num: > let add x y = x + y
In Haskell, is there a way to restrict a monad M a so that a satisfy a type class constraint? I am translating the probabilistic modeling example from F# to Haskell. However, in Haskell, I omitted su
I have a type constructor type SimpleFcn α m = m α -> m α and I want to use it in a class where it will be further parameterized later. Namely,
Context I\'m writing a Haskell module that represents SI prefixes: module Unit.SI.Prefix where Each SI prefix has a corresponding data type:
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