map -package:containers -package:blaze-html -is:exact -package:insert-ordered-containers -package:monoidal-containers -package:base-compat -package:basement -package:psqueues -package:regex-tdfa -package:dlist -package:base -package:os-string -package:vector -package:conduit 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