map -package:containers -package:insert-ordered-containers -package:basement -package:monoidal-containers -package:psqueues -package:conduit -package:ghc -package:imports -package:text -is:exact -package:regex-tdfa -package:vector -package:dlist 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