Steve Howell <showel...@yahoo.com> writes: >> http://haskell.org/ghc/docs/6.10.4/html/users_guide/syntax-extns.html... >> might be of interest. Maybe Ruby and/or Python could grow something similar. > Can you elaborate?
List comprehensions are a Python feature you're probably familiar with, and I think Ruby has something like them too. They originally came from Haskell. GHC (the main Haskell implementation) now supports an extended list comprehension syntax with SQL-like features. I haven't used it much yet, but here's an example from a poker ranking program (http://www.rubyquiz.com/quiz24.html) that I did as a Haskell exercise: let (winners:others) = [zip c ls | ls <- lines cs , let {h = mkHand ls; c=classify h} , then group by c , then sortWith by Down c] It's reasonably evocative and doing the same thing with the older syntax would have been a big mess. "Down" basically means sort in reverse order. -- http://mail.python.org/mailman/listinfo/python-list
