map -package:Cabal -package:base -package:case-insensitive -package:bytestring -package:blaze-html -package:containers -package:aeson -package:regex-tdfa -package:vector -package:text -package:haskell-gi-base package:streaming is:exact

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