map -package:containers -package:Cabal-syntax -package:bytestring -package:base -package:basement -package:charset is:exact -package:incipit-base -package:aeson -package:psqueues package:ghc

map :: Monad m => (a -> b) -> Stream m a x -> Stream m b x
ghc GHC.Data.Stream
Apply a function to each element of a Stream, lazily
map :: (a -> b) -> [a] -> [b]
ghc GHC.Prelude.Basic
map f xs is the list obtained by applying f to each element of xs, i.e., 
map f [x1, x2, ..., xn] == [f x1, f x2, ..., f xn]
map f [x1, x2, ...] == [f x1, f x2, ...]

>>> map (+1) [1, 2, 3]
[2,3,4]