On 07:33 Wed 06 May , Hannousse wrote:
Hello,
I'm interested to the concept of arrows in Haskell, however, I couldn't find a real application or example using this new technology in a real world application. All what I found are just academic examples and other people developing new specific libraries using arrows.Could someone, please, give me a reference to one of the real applications that uses arrows.
Hi. HXT, the Haskell XML Toolbox [1], uses Arrows to define filters and modifications of XML trees. A structure called ListArrow can return several results, the Arrow combinators allow them to be used together in a clean way. There are Arrows that carry mutable state and perform IO, too. Also see the wiki page [2] and Hackage documentation [3]. It took me a while to understand what really goes on, but worked quite well then. Steffen [1] http://hackage.haskell.org/cgi-bin/hackage-scripts/package/hxt [2] http://haskell.org/haskellwiki/HXT [3] http://www.fh-wedel.de/~si/HXmlToolbox/hdoc/index.html