All Questions
7 questions
2
votes
1
answer
560
views
What is the advantage of Option/Maybe Monad over Functor?
I understand the advantage of IO monad and List Monad over Functor, however, I don't understand the advantage of Option/Maybe Monad over Functor.
Is that simply the integration of types of the ...
- 652
6
votes
3
answers
1k
views
How are Functors useful?
We know that any generic type F[_] withmap method, which complies to some laws, is a functor. For instance, List[_], Option[_], and F[A] = Env => A are functors. I am just wondering if this functor ...
- 42.2k
7
votes
2
answers
974
views
Why is there no "Functor" trait in Scala? [closed]
In Scala, the generic classes such as Future, Option and List all have methods map and flatMap. As I understand, all of them are like Functors in Haskell.
I was just wondering why there isn't a ...
- 47.2k
62
votes
3
answers
4k
views
Sets, Functors and Eq confusion
A discussion came up at work recently about Sets, which in Scala support the zip method and how this can lead to bugs, e.g.
scala> val words = Set("one", "two", "three")
scala> words zip (words ...
- 47.4k
7
votes
1
answer
800
views
example uses scalaz.Lens's modf, modp and xmap
There are number of great tutorials and posts out there covering the more straightforward of Lens's methods, e.g. Cleaner way to update nested structures; can anyone provide example uses for these ...
- 1,939
4
votes
5
answers
478
views
What are the exact applications of Functor, PointedFunctor, ApplicativeFunctor and Monad? [closed]
I have been studying Scala (and Haskell by extension) for some time now and I'm totally captured by their type system and functional paradigm. Quite recently I stumbled upon "Type Level Programming" ...
- 22.4k
7
votes
2
answers
1k
views
how to translate Haskell into Scalaz?
One of my high school students and I are going to try to do a port of Haskell's Parsec parser combinator library into Scala. (It has the advantage over Scala's built-in parsing library that you can ...
- 2,260