map -package:containers -package:aeson -package:basement -package:psqueues -package:dense-linear-algebra -package:dlist -package:ghc -package:os-string -package:blaze-html -package:conduit -package:invertible -package:insert-ordered-containers -package:integration -package:amazonka-core -package:vector -package:filepath package:vector-stream

Map a function over a Stream
Map a monadic function over a Stream
Execute a monadic action for each element of the Stream
Apply monadic function to each element and drop all Nothings