I want to write \'twice\' function that takes a function and an argument and applies the function twice. However the function that it receives should work on union types.
I\'ve been considering using Haskell\'s Parsec parsing library to parse a subset of Java as a recursive descent parser as an alternative to more traditional parser-generator solutions like Happy. Pars
What are the usual causes of \"Error C stack overflow\" in the Hugs Haskell i开发者_开发问答mplementation.This can come up if you are used to functional languages in which it is common to do tail-recu
Following the (accepted) answer from this question, I am expecting the following to work: Prelude Text.Regex.Posix Text.Regex.Base.RegexLike Text.Regex.Posix.String> makeRegex \".*\"
is there a difference like that from IO String to String i 开发者_JS百科want to take some String values from a IO.
What is Ha开发者_开发知识库skell\'s equivalent of string str = string.Format(\"{0} {1}\",10,20); // C#
Could anyone give some pointers on why the impure开发者_如何学JAVA computations in Haskell are modelled as monads?
I have this code that I want to make point-free; (\\k t -> chr $ a + flip mod 26 (or开发者_C百科d k + ord t -2*a))
Do you know if are there pointers in Haskell? If yes: how do you use them? Are there any problems with them? And why aren\'t they popular?
Suppose I\'m writing a function that takes a list of integers and returns only those integers in the list that are less than 5.2. I might do something like this:
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