map -package:containers -package:Cabal-syntax -package:aeson -package:insert-ordered-containers -package:invertible -package:monoidal-containers -package:blaze-html -package:basement -package:os-string -package:regex-tdfa -package:conduit -package:vector -package:bytestring 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