Mixing the lexer and parsing phases in one phase sometimes makes Parsec parsers less readable but also slows them down. One solution is to use Alex as a tokenizer and then Parsec as a parser of the to
I\'m completely new to Haskell. To grasp the basics I\'ve started working through \'Learn you a Haskell for Great Good\'. I\'m stuck on the simple matter of loading a function from a file.
I got both ghc6 and ghc7 on my desktop. To install new packages (for the specific ghc version), I use cabal with the flag --with-compiler=<ghc-dir> to specify开发者_C百科 for which ghc i want th
I tried looking up Int -> [a] -> Maybe a on hoogle, but no luck. I feel like this should be in a stan开发者_Python百科dard library somewhere, but I don\'t know where.There is a library called S
How do you define state in Haskell? My first idea was to use algebraic data types. I\'ve also heard about the state monad, but I don\'t really know what it is.
I would like to use a collection of function names as Data.Map keys, and have the key for each function automatically available from within that function. I am willing to consider \"unsafe\" operation
Is开发者_运维知识库 there a Haskell interpreter that accepts type definitions or preferably all kinds of statements?
I have a collection of records spread across a number of types in a large Haskell application that reference each other. All of the types involved implement a common typeclass. The typeclass contains
In (very) modern GHC\'s, I can write this: {-# LANGUAGE TypeFamilies #-} -- consider this part \"library\" code, changeable at will
module Data where data Cons a = Con (a -> Bool) deriving (Show) twoCons :: Cons a -> Cons a -> Cons a
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