This way :
do
times<-mapM PF.getFileStatus filenames >>= return.(map
PF.modificationTime)
Or also :
do
times<-mapM (PF.getFileStatus >>= (return.(PF.modificationTime)))
filenames
let sorted=...
I do not know exactly how ghc compiles the IO monad, but it seems to me that
the latter would allocate a little less.
Cheers,
PE
El 06/05/2010, a las 01:01, <bri...@aracnet.com> <bri...@aracnet.com> escribió:
>
> I was doing the following:
>
>
> do status <- mapM PF.getFileStatus filenames
> let times = map PF.modificationTime status
> let sorted = sortBy (\(_, t1) (_,t2) -> compare t1 t2) (zip filenames times)
>
> and I thought, surely I can combine the status and times definitions into one
> line, only I can't.
>
> Hint ?
>
> Thanks,
>
> Brian
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