map -package:containers -package:bytestring -package:Cabal-syntax -package:basement -package:aeson -package:pipes -package:charset -package:os-string -package:insert-ordered-containers -package:monoidal-containers -package:unordered-containers -package:vector -package:filepath 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