Re: [Haskell-cafe] mapFst and mapSnd

On Tue, May 28, 2013 at 7:46 PM, Dominique Devriese < dominique.devriese@cs.kuleuven.be> wrote:

2013/5/28 Tikhon Jelvis :

...

These are present in Control.Arrow as (***), first and second respectively.

Right, thanks. Strange that neither Hayoo nor Hoogle turned these up..

HLint suggested Control.Arrow.&&& and Control.Arrow.first to me the other day: $ hlint Checker.hs Checker.hs:65:5: Warning: Reduce duplication Found: topdir <- ask md5file <- computeChecksumFilename f hasChecksum <- liftM not $ isChecksumMissing f Why not: Combine with Checker.hs:81:5 Checker.hs:127:96: Warning: Use &&& Found: \ x -> (s3Path x, s3Md5sum x) Why not: s3Path Control.Arrow.&&& s3Md5sum Checker.hs:153:42: Warning: Use first Found: \ (x, y) -> (trimPathPrefix path x, y) Why not: Control.Arrow.first (trimPathPrefix path) 3 suggestions Some people that I know have HLint incorporated into their vim sessions, I think using Syntastic. Cheers, -- Carlo Hamalainen http://carlo-hamalainen.net