map -package:ghc is:exact -package:bytestring -package:aeson -package:charset package:base-prelude

map :: (a -> b) -> [a] -> [b]
base-prelude BasePrelude
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]