Apologies for the self-plug, but I tried to write up a "friendly" intro to the Haskell lens library as well https://www.fpcomplete.com/school/to-infinity-and-b

Apologies for the self-plug, but I tried to write up a "friendly" intro to the Haskell lens library as well https://www.fpcomplete.com/school/to-infinity-and-beyond/pick-of-the-week/a-little-lens-starter-tutorial https://www.fpcomplete.com/school/to-infinity-and-beyond/pic...