Re: [Haskell-cafe] Comments and suggestions on code

11 Jan 2008


      On 11 Jan 2008, at 2:24 PM, Andre Nathan wrote:
...
processEntry :: DirStream -> IO ()
processEntry ds = do
  entry <- readDirStream ds
  if entry =~ "^[0-9]+$"
    then do
      putStrLn entry
      processEntry ds
    else
      if entry == "" then return () else processEntry ds
bar :: IO ()
bar = do
  ds <- openDirStream "."
  processEntry ds
  closeDirStream ds
This is a 200% increase in code size for a 75% decrease in execution  
time.  (And, in general, the complexity can be much higher).  That's  
an engineering tradeoff, and one you'll have to decide yourself;  
there's not much that can be done to make it go away.

jcc

Re: [Haskell-cafe] Comments and suggestions on code

Jonathan Cast