:: (a -> b) -> [a] -> [b] -package:brittany -package:utility-ht -package:rebase -package:shelly package:xmonad-contrib -is:exact is:exact

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, ...]