Re: [Haskell-cafe] Proposal: Applicative => Monad: Call for consensus

On Tue, Jan 25, 2011 at 05:13, Ryan Ingram wrote:

On Fri, Jan 21, 2011 at 7:58 PM, Casey Hawthorne wrote:

...

uj supplied this:

About the discussion "putStrLn (readLn + (5 :: Int))"..

I'll write it as the following line,

importing Control.Applicative main = (+) readLn (return 3)

They look almost exactly same in my eyes..

You're missing some bits.

main = print =<< liftM2 (+) readLn (return 3)

Which I assert looks like more line noise than some perl programs I've read. :)

Why not just: main = print . (+3) =<< readLn This reads almost as well as a function composition f . g . h, I think. Erik P.S. I wanted to say you could also write it left-to-right using >>> from Control.Arrow, but that need parentheses: main = readLn >>= ((+3) >>> print)