Questions tagged [haskell]
A functional programming language
260 questions
0
votes
0
answers
719
views
Haskell where clause: is it more than just a matter of taste?
The traditional (Scheme, Pascal) way to structure code is this:
declare outer function
declare inner function
body of inner function
body of outer function
The where clause in Haskell moves ...
- 401
1
vote
0
answers
70
views
Haskell: Data Modeling an Internal App that Interfaces with a 3rd-Party Library?
I wrote a java call graph generator with tree sitter (the 3rd-party library in question)'s python binding. I am doing a thought experiment on how I might model the same application in Haskell. I am ...
- 111
1
vote
1
answer
346
views
In what sense are functions like fst and snd determined uniquely by their type signature in Haskell?
I have recently given Haskell another go, mostly because I heard about the book Haskell from first principles and so far I'm having a blast. My background is that of a mathematician mostly working in ...
- 119
6
votes
1
answer
520
views
Terse finite state machines in Haskell
I'm writing a parser for a markup language in haskell, and a finite state machine fell out of my ideal API. I have code that looks a bit like this:
Token = BoldWord String | Word String | ...
user361757
31
votes
3
answers
6k
views
Definition of "functor"; Haskell vs. C++
I'm trying to understand whether the Haskell and C++ communities mean different things by the word "functor", or if there's some underlying concept that unifies the two meanings.
My ...
- 421
0
votes
2
answers
230
views
Is a safe function returning Maybe partial or total?
The Elm Guide says to use Maybe for partial functions, but I was under the impression that returning Maybe solves the problem of partial functions and makes them total. It gives a value from the ...
- 119
0
votes
1
answer
172
views
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
9
votes
4
answers
4k
views
Functional programming - what to learn and who uses it
I'm a .Net and Angular developer who's been working with OO languages throughout my education and work history. Lately I've been thinking about spending some time with one of the functional ...
- 425
0
votes
1
answer
242
views
How do Haskell Lists Desugar?
So, I was wondering about how Haskell's lists are implemented. I looked it up, and found this:
data [] a = [] | a : [a]
So I get that you can write lists like this if you want to:
a:b:c:[] -- ...
3
votes
3
answers
250
views
Precisely define "what to solve" and "how to solve" corollary in functional and imperative programming respectively
I am not sure if I ever clearly understood standard corollary "what to solve" and "how to solve" used to point out difference between functional (declarative) and imperative programming paradigm ...
- 1,450
-3
votes
2
answers
159
views
How can we handle inserts/delete cases using Map like data structures in FP?
Let's say, that we keep track of students entering the auditorium using their IDs(Key) and their check-in time(Value) in a Map. We delete the entries once they move out of the auditorium. I want to ...
- 399
6
votes
1
answer
752
views
What's the benefit of avoiding partial functions in Haskell?
AFAIK in Haskell it is heavily recommended to avoid partial functions; and if these seem unavoidable (eg head) then return a Maybe. At least, so the Haskell wiki says 1 2
What's the use of the ...
- 4,529
2
votes
1
answer
329
views
Placing Haskell typeclass instances
I'd like to hear some pros and cons about where it's best to put Haskell typeclass instances. I identify 2 possible cases and can not decide for myself which one is best:
Put the instances together ...
- 368
0
votes
3
answers
738
views
In which way Haskell limit side effects?
From what I gathered from learning Haskell, functional programming limits the amount of side effects, but in what ways? Hope someone can enlighten me on this one.
- 111
1
vote
4
answers
499
views
In Haskell, is it a "violation" of functional programming to interact with something that was not a function parameter?
I'm sure this must have been asked before, but I can't find anywhere that actually answers my question, so apologies if I have simply overlooked this.
I am currently learning Haskell, and loving the ...
- 141