map -package:containers -package:aeson -package:conduit -package:basement -package:regex-tdfa -package:blaze-html -package:integration -package:dlist -package:insert-ordered-containers -package:text -package:psqueues -package:vector 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