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Results tagged with haskell
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user 4495
Haskell is a purely functional programming language, featuring static typing, lazy evaluation, and monadic effects. The primary implementation is GHC, a high-performance compiler with a runtime supporting many forms of parallelism and concurrency.
7
votes
Each element is the sum of itself with the next element of a List: now do this point-free in...
Pointfree, eh? Let's ask lambdabot.
<DanBurton> @pl map (\(y, z) -> y + z) (zip x (tail x))
<lambdabot> zipWith (+) x (tail x)
Assuming that x is simply the input to this "function"
<DanBurton> @p …
- 705
3
votes
Can I use mapWriterT instead of mapM/mapM_ (Haskell)?
mapWriterT is for transforming one WriterT into another. Its type is painfully generic, but allows you to transform pretty much everything about a WriterT.
mapWriterT :: (m (a, w) -> n (b, w')) -> Wr …
- 705
10
votes
Simple chat server in Haskell
Haskell's threads are lightweight, so you can write your code using blocking calls and multiple threads, and rest assured that behind the scenes Haskell is using epoll. … [Haskell] so hard to reason about, especially when exceptions come into the picture.
Exceptions are best avoided in Haskell, but you seem to have been able to reason about them fairly well. …
- 705
3
votes
Printing a factorial from an integer
Reifying a few of sepp2k's suggestions:
module Main where
import Data.Char
factorial :: Integer -> Integer
factorial n = product [1..n]
isNat :: String -> Bool
isNat [] = False
isNat st = all isDig …
- 705
10
votes
Accepted
Periodically comparing the play count of two Last.FM users
I don't see why you say <- "decreases readability", but you could line them up if you think that helps (this style is typical of Haskell programmers)
main = forever $ do
diff <- user1 `subtractCounts …
- 705
7
votes
Accepted
How to shorten this terrible HTTP header parser?
You can use hGetContents to read lazily from a handle, and the split package (which will hopefully be bundled into the next Haskell Platform release) provides some nice ways of dealing with lists. … Keep an eye on conduit & friends; I get the feeling that within the next year or so the Haskell community will start to agree on the "best" implementation of this sort of abstraction, and then some good …
- 705