map -package:containers -package:insert-ordered-containers -package:dense-linear-algebra -package:invertible -package:case-insensitive -package:basement -package:hedgehog -package:psqueues -package:incipit-base is:exact -package:imports -package:base-compat package:pipes

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

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