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map is:exact -package:bytestring -package:containers -package:basement -package:dlist -package:regex-tdfa -package:hedgehog -package:foldl -package:invertible 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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