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map -is:exact -package:basement -package:base -is:exact -package:containers -package:imports -package:ghc is:exact -package:invertible -package:filepath -package:psqueues -package:charset 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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