Questions tagged [monad]
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46 questions
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Does C# 8 reference type nullability make Option/Result monad obsolete?
As the most common exceptions in my project are NullReferenceExceptions I'm trying to find a way to limit the occurrence of problems with unexpected or unhandled nulls to the minimum.
One of the ...
- 161
2
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3
answers
958
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Exceptions vs Monads
I am curious about the utility of something like monads in the C# world.
My experience with these kinds of things is mainly through Rust but I'm a dotnet dev for work
I was thinking about the ...
- 131
0
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1
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156
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If we don't use function composition, does Maybe remain a monad?
A monad is a monoid in the category of endofuctors. Category is a set of two things:
Set of elements
Set of binary operations between these elements.
When we talk about the category endofunctors we ...
- 449
2
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1
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216
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Struggling to find the relation between a Maybe structure and the endofunctor
Monad is a monoid in the category of endofunctors. Endofunctor is a functor that maps to itself. What does it mean? Well it means that, no matter which element in the set is taken as an input, the ...
- 449
2
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2
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834
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What's the value of IO Monad?
When I'm writing code in the form of IO Monad, I wonder what's real value of it.For example I have a function as def something(in: In): IO[Out]; my function is a pure function that **returns an impure ...
- 169
0
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1
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Imperative parallels to Haskell's Monad operations
Would it be (mostly) correct to say that the following are the parallels to the Haskell Monad operations in the imperative world?
Monad's >> ~ C/C++/JavaScript/etc. , operator
do expressions ~ C/...
- 339
5
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1
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FP Free Monad vs OOP Dependency Injection
I've written my first moderately large project in functional style (in F#) and can see the advantages. The main challenge was to achieve the "Onion" architecture i.e. large and "smart" pure core / ...
- 645
3
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1
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How can the `log` function be used for formal verification
In JavaScript I want to create a log function:
function log(string) {
console.log(string)
}
Obviously this causes side effects; it prints to the screen. And I have no control over its ...
- 259
2
votes
2
answers
792
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What's the proper way to think about state monads?
I've been using a functional approach in my programming of late. I know that mutability and state changes are big no nos within the paradigm. I now find myself working with databases and other data ...
- 1,312
17
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4
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3k
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When programming in Functional style, do you have a single application state that you weave through the application logic?
How do I construct a system that has all of the following:
Using pure functions with immutable objects.
Only pass into a function data that the function it needs, no more (i.e. no big application ...
- 299
8
votes
1
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IO Monadic code: standard vs flipped function composition
Below is a line that handles socket connections in a simple Haskell program.
mainLoop :: Socket -> IO ()
mainLoop sock = accept sock >>= forkIO . handle . fst >> mainLoop sock
The "...
- 1,320
3
votes
0
answers
441
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Clojure: Decomposing Logging, Metrics, and Business Logic from a Function
I was reading the post A Modern Architecture for FP that included a code snippet that the author wanted to decompose further. I don't know Haskell but I recognize enough to know that I've written many ...
- 139
0
votes
3
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461
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Monads in JavaScript
A monad is an object that has:
A transformation that takes a type and produces a new type. In C# we call such a transformation a "generic type". We have a generic type
M<T>, we have a ...
- 730
6
votes
4
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2k
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Minimal programmer's definition of a monad
I am trying to formulate a definition of a monad without needing mathematical terms or Haskell to understand.
Can a monad be thought of as a function that accepts a value and wraps it such that it ...
- 730
20
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1
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9k
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What is a Comonad and how are they useful?
Recently I've been dusting off my knowledge on how Monads work. I've also been introduced to the concept of a 'Comonad', which is described as the inverse dual of a monad. However, I am impossible to ...
- 4,937