monads

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Restricting a monad to a type class

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[详细]

2023-03-31 18:02 分类：问答
Generating output in a running haskell program

Coming from (SWI) Prolog I find it very difficult to have Haskell give output on the fly. The simplest example, I\'d like Haskell to print something on every iteration:[详细]

2023-03-31 08:26 分类：问答
What is the name of this monad-like functional programming pattern?

I have occasionally encountered a pattern in code which resembles a monad but does not keep a consistent type across >>=.[详细]

2023-03-29 19:18 分类：问答
When to use Haskell monads

I\'m implementing a combinatorial optimization algorithm in Haskell: Given an initial candidate solution, repeat until st开发者_如何学JAVAopping criteria are met:[详细]

2023-03-29 06:02 分类：问答
Applicatives compose, monads don't

Applicatives compose, monads don\'t. What does the above state开发者_运维问答ment mean? And when is one preferable to other?If we compare the types[详细]

2023-03-28 05:05 分类：问答
for..else for Option types in Scala?

Suppose I have two Options and, if both are Some, execute one code path, and if note, execute another.I\'d like to do something like开发者_如何学Python[详细]

2023-03-24 18:39 分类：问答
Monads: What's the difference between seq and >>=?

What\'s the differ开发者_开发百科ence? Does seq guarantee more flow conditions?They aren\'t related at all.[详细]

2023-03-23 16:24 分类：问答
Managing a stateful computation system in Haskell

So, I have a system of stateful processors that are chained together. For example, a processor might output the average of its last 10 inputs. It requires state to calculate this average.[详细]

2023-03-23 06:37 分类：问答
How to define a Monad instance "m a" with "a" in Typeclass Show?

I would like to define a monad instance with the container M as monad and with the contained type a which should be a member of class Show. This constraint (that a is member of Show) should be ensured[详细]

2023-03-22 04:33 分类：问答
Haskell: actual IO monad implementation, in different language?

How is IO monad actually implemented?in sense of, what would be the actual implementation of the main function?开发者_如何学运维[详细]

2023-03-19 03:01 分类：问答