On Thu, Aug 20, 2015 at 12:30 PM, William Yager <will.yager@gmail.com> wrote:

a classic from way back in the 90s (map vs fmap)

The arguments surrounding FTP are also relevant. See

http://neilmitchell.blogspot.com/2014/10/why-traversablefoldable-should-not-be.html

There isn't always a "right" answer but a spectrum of trade-offs.

-- Kim-Ee