Hello all. I was just thinking that there ought to be a better way to
write the following code. It seems to be a common case that within a 'do'
I bind a variable that I only intend to use once, in an if or case
statement. It occurred to me that there ought to be a better way to do
this. For example, it seems like the following code:
whatisit :: String -> IO String
whatisit f = do
isdir <- doesDirectoryExist f
if isdir
then return "dir"
else do isfile <- doesFileExist f
if isfile
then return "file"
else return "nothing"
could be replaced by something like:
whatisit :: String -> IO String
whatisit f = do
ifM doesDirectoryExist f
then return "dir"
else ifM doesFileExist f
then return "file"
else return "nothing"
Is there any way I could do something like this?
--
David Roundy
http://civet.berkeley.edu/droundy/
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