map -package:containers -package:insert-ordered-containers -package:base-compat -package:monoidal-containers -package:basement -package:integration -package:incipit-base -package:os-string -package:aeson -package:pipes -package:dlist -package:base -package:invertible -package:conduit -package:dense-linear-algebra -package:hedgehog -package:case-insensitive -package:text -package:regex-tdfa -package:unordered-containers 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