Say I want to execute the command unrar x archivename from within Haskell. What is the best way to do it and how do I get the exit code of 开发者_Python百科the command? If the command exited successf
Context I\'m writing a Haskell module that represents SI prefixes: module Unit.SI.Prefix where Each SI prefix has a corresponding data type:
I\'m just starting to teach myself Haskell out of the book \"Learn you a haskell for great good\", and I rewote the quicksort in Chapter 5 using where:
I am stumped as to why this code compiles with type hints, but does not compile without. There shouldn\'t be any instance ambiguities (there is one instance).
The uncurry function only works for functions taking two arguments: uncurry :: (a -> b -> c) -> (a, b) -> c
I follow installation steps given on http://www.yesodweb.com/book/TXKGPHUZXDLYRGF the command \"cabal install alex happy\" fails with the error below.
I\'m using Mac OS X 10.5.8.Anot开发者_开发知识库her question indicated that Leksah is the IDE of choice for Haskell development.
I wrote the following program to check strings for balanced parenthesis: isBalanced xs = isBalanced\' xs []
If I want to apply f first and g second, I have to write: g . f Is there another standard syntax that would allow me to write the functions in the reverse order?
I want to read HTML from a String, process it and return the changed document as a String using HXT. As this operation does not require IO, I would rather execute the Arrow with runLA than with runX.
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