map -package:containers -package:charset -package:imports -package:conduit -package:Cabal-syntax -package:invertible -package:bytestring -package:foldl -package:case-insensitive -package:dense-linear-algebra -package:incipit-base package:pipes -is:exact is:exact

Apply a function to all values flowing downstream
map id = cat

map (g . f) = map f >-> map g