To help me learn Applicative Functors and Functors I thought it would be good fun to see how Either is implemented with the typeclasses Functor and Applicative. Obviously I could just go ahead and rea
It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical andcannot be reasonably answered in its current form. For help clari
Imagine you have a rating like Rating = OneStar | TwoStars | ThreeStars | FourStars | FiveStars What is the best way to instanciate/implement \"Ord\" for such an algebraic data type in Has开发者_JA
I\'ve been participating in a programming contest and one of the problems\' input data included a fractional number in a decimal format: 0.75 is one example.
Is this efficient for checking multiple statements in Haskell? Or this there a better way? case ((x > -10) && (x < 20),x /= 9,(x `mod` 2) == 0,x) of
Haskell blew my mind yet again when I realised that (x,y) Is just syntactic sugar for (,) x y Naturally I wanted to extend this to larger tuples. But
What is the functional programming equivalent of the decorator开发者_如何学Python design pattern?
I\'ve been reading about combinators and seen how useful they are (for example, in Haskell\'s Parsec).My problem is that I\'m not quite sure how to use them practically.
checkstring :: [String] -> Int -> [String] checkstring p n = doz <- doesFileExist (p !! n) if z
If I have an ADT with specified typeclass restricti开发者_StackOverflowons I still have to specify the same typeclass for each function using this data type. What the reason for this and how can I red
加载中,请稍侯......