map is:exact -package:text -package:amazonka-core -package:base-prelude -package:bytestring -package:aeson -package:insert-ordered-containers -package:containers -package:base -package:monoidal-containers -package:hedgehog -package:dense-linear-algebra package:pipes

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

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