map -package:containers -package:basement -package:psqueues -package:Cabal-syntax -package:conduit -package:amazonka-core -package:filepath -package:dense-linear-algebra -package:aeson -package:foldl -package:bytestring -package:base -package:blaze-html -package:os-string -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