map -package:vector -package:conduit -package:blaze-html -is:exact -package:dlist -package:basement -package:base-compat-batteries -package:monoidal-containers -package:hedgehog -package:case-insensitive -package:incipit-base -package:base-compat -package:containers -package:regex-tdfa -package:integration -is:exact -package:dense-linear-algebra -package:foldl -package:filepath -package:invertible -package:charset 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