I would like to check that homomorphism Applicative law holds for datatype BinTree: {-# LANGUAGE ScopedTypeVariables #-} {-# LANGUAGE AllowAmbiguousT ...
I would like to check that homomorphism Applicative law holds for datatype BinTree: {-# LANGUAGE ScopedTypeVariables #-} {-# LANGUAGE AllowAmbiguousT ...
I am aware that the following question exists: haskell - How to quickcheck applicative homomorphism property? - Stack Overflow However, the introduc ...
Is there a standard function, or family of functions, for sequencing tuples of applicatives, as a generalization of sequenceA? Like the following, exc ...
In Monoid and Semigroup instances of Alternative Alt used. Why we can't write instance without it? And if we can write that, can we then replace A ...
I am using the hardware description tool Clash. Though this is a hardware description tool, my question is purely about Haskell. There is a datatype ...
I don't see it here by the definition of EitherT, nor here by the definition of Applicative. Shouldn't it be defined within the type module or within ...
I have a list of entities where even one failed validation would yield an error. However, I'd still like to iterate the whole list and collect all the ...
I´m trying to understand haskell and I´m stuck with a "cannot construct the infinite type"-error I want to implement "<*>" for my own data type ...
As an exploration of how variance works, I've come up with this type that could be both a Functor and a Contravariant depending on its arguments: new ...
I have 2 Optionals (or Maybe objects) that I would like to combine so that I get the following results: In other words, a non-empty Optional always ...
I've been experimenting with monoids and Distributives lately, and I think I've found something of interest (described in my answer) - are these alrea ...
Pure is used to transform normal function into function in Applicative container. With this, any multi-parameter operations become can be used on Appl ...
internalAnd :: Bool -> Bool -> Bool internalAnd True True = True internalAnd _ _ = False (&&) :: Applicative m => m Bool -> m Boo ...
CompletableFuture is a Monad given its methods thenCompose and thenApply, which correspond to >>= (bind) and fmap in Haskell. It is a well know ...
What is the point of making Functor a super class of Applicative and Monad. Both Applicative and Monad immediately imply the only implementation of Fu ...
I recently saw a simple example that brought <* and *> to light. This shows that the effects are important even if the values they produce ar ...
Since the Functor-Applicative-Monad Proposal, Monads are a subclass of Applicative which in turn is a subclass of Functor. Mathematically speaking, th ...
Consider this type: I have some functions that all take the same input, and may fail to compute a field: I can write a function that tries all t ...
Update There is an extra limit of this question, which is to avoid IO as much as possible. This limit was originally placed at the end of my questio ...
I am learning Haskell. One of the exercises I was asked to do was to compute all sums of a power set of a set of integers, e.g.: I came up with thi ...