map -package:Cabal -package:base -package:text -package:pipes -package:containers -is:exact -package:hedgehog -package:ghc -package:regex-tdfa is:exact -package:dlist -package:conduit package:streaming

Standard map on the elements of a stream.
>>> S.stdoutLn $ S.map reverse $ each (words "alpha beta")
ahpla
ateb