haskell - Flipped / reversed fmap (<$>)?

Question

I found defining the following

(%)  = flip fmap

I can write code like this:

readFile "/etc/passwd" % lines % filter (not . null)

To me it makes more sense than the alternative:

filter (not . null) <$> lines <$> readFile "/etc/passwd"

Obviously, it's just a matter of order.

Does anyone else do this? Is there a valid reason not to write code like this?

Answer 1

Your operator (%) is exactly the operator (<&>) from the lens package.

It can be imported with:

import Control.Lens.Operators ((<&>))