map -package:containers -package:blaze-html -is:exact -package:insert-ordered-containers is:exact -package:dlist -package:aeson -package:filepath -package:amazonka-core -package:os-string -package:base-prelude -package:dense-linear-algebra package:pipes

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

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