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map is:exact -package:text -package:containers -package:charset -package:bytestring -package:invertible -package:filepath -package:conduit -package:Cabal-syntax -package:base-prelude package:pipes
map
:: Functor m => (a -> b) -> Pipe a b m r
pipes
Pipes.Prelude
Apply a function to all values flowing downstream
map id = cat map (g . f) = map f >-> map g
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