Re[2]: [Haskell-cafe] Haskell and C++ program

14 Jan 2009


      Hello Jonathan,

Thursday, January 15, 2009, 1:41:23 AM, you wrote:
...
reverseDouble =
        unlines
      . intro
      . map show
      . reverse
      . map (read :: String -> Double)
      . takeWhile (/= "end")
      . words
using arrows, this may be reversed:

  reverseDouble =
          words
      >>> takeWhile (/= "end")
      ...
...
I observe also in passing that the cast on read is somewhat inelegant;
in a real application, the consumer of map read's output would specify
its type sufficiently that the cast would be un-necessary.
in small scripts explicit read casts are rather common


-- 
Best regards,
 Bulat                            mailto:Bulat.Ziganshin@gmail.com

Re[2]: [Haskell-cafe] Haskell and C++ program

Bulat Ziganshin