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Published on 2010-03-20T06:01:59Z
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Why is it that I can do the following:
getW1 :: ErrorT String Get Word8
f1 = (+1) <$> getW1
but I cannot do:
f2 = (+) <$> getW1 <*> getW1
?
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Trying to learn Haskell. I am trying to write a simple function to remove a number from a list without using built-in function (delete...I think). For the sake of simplicity, let's assume that the input parameter is an Integer and the list is an Integer list. Here is the code I have, Please tell me…
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I'm trying to use Haskells Data.Heap module, but I'm incapable of even using it with integers. The only heap I've been capable of using is "empty", which does not take any arguments.
Later on I'll figure out how to instance for my needs, but for now I'd be glad if I was even able to test it with…
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There has been some intermingling of Scala and Haskell communities, and I have noticed now and then people commenting on stuff that's supposed to be easy in Haskell and hard and Scala. Less often (maybe because I read Scala questions, not Haskell ones), I see someone mentioning that something in Scala…
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I have problems installing ghc-mod on my linux machine. cabal worries about "happy" not being available in versione = 1.17:
$ cabal install ghc-mod
Resolving dependencies...
[1 of 1] Compiling Main ( /tmp/haskell-src-exts-1.14.0-1357/haskell-src-exts-1.14.0/Setup.hs, /tmp/haskell-src-exts-1…
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fibs :: [Int]
fibs = 0 : 1 : [ a + b | (a, b) <- zip fibs (tail fibs)]
This generates the Fibonacci sequence.
I understand the behaviour of the guards, of :, zip and tail, but I don't understand <-. What is it doing here?
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Why is it that I can do the following:
getW1 :: ErrorT String Get Word8
f1 = (+1) <$> getW1
but I cannot do:
f2 = (+) <$> getW1 <*> getW1
?
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Limit the size of your logging
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Talend dévoile sa roadmap produits 2011
Pour sa plate-forme unifiée d'intégration applicative et de gestion de données
Talend, l'un des leaders mondiaux des logiciels open source, a livré aujourd'hui les premiers détails de sa roadmap produits, qui intègre les produits et la technologie issus…
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Whilst trying to better understand Applicative, I looked at the definition of <*, which tends to be defined as ap, which in turn is defined as:
ap :: (Monad m) => m (a -> b) -> m a -> m b
ap = liftM2 id
Looking at the type signatures for liftM2 and…
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I've read this article, but didn't understand last section.
The author says that Monad gives us context sensitivity, but it's possible to achieve the same result using only an Applicative instance:
let maybeAge = (\futureYear birthYear -> if futureYear < birthYear
then yearDiff birthYear…
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