Re: [Haskell-cafe] Reversing a string of words: C# v Perl V Ruby v Haskell

11 Dec 2006

      Hi Steve,

On 12/11/06, Steve Downey  wrote:
...
transforming "one two  three four    " into "    four   three  two
one",  how could this be done?
This is a good problem for
Parsechttp://www.cs.uu.nl/%7Edaan/download/parsec/parsec.html
:

import Text.ParserCombinators.Parsec

reverseWords = concat . reverse . split
   where
      split = fromRight . parse wordsSpaces ""
      fromRight (Right s) = s
      wordsSpaces = many (many1 space <|> many1 alphaNum)

-Greg

Re: [Haskell-cafe] Reversing a string of words: C# v Perl V Ruby v Haskell

Greg Fitzgerald