map -package:containers -package:Cabal-syntax -package:blaze-html -package:conduit -package:monoidal-containers -package:psqueues -package:os-string -package:basement -is:exact -package:text -package:case-insensitive -package:vector -package:invertible package:vector-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