map -package:amazonka-core -package:bytestring -package:base -package:case-insensitive -package:basement -is:exact -package:hedgehog -package:charset -package:imports is:exact -package:Cabal-syntax -package:incipit-base -package:os-string package:pipes

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

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