dhall-1.3.0: Prelude/List/map

{-
Tranform a list by applying a function to each element

Examples:

```
./map Natural Bool Natural/even ([+2, +3, +5] : List Natural)
= [True, False, False] : List Bool

./map Natural Bool Natural/even ([] : List Natural)
= [] : List Bool
```
-}
let map : ∀(a : Type) → ∀(b : Type) → (a → b) → List a → List b
    =   λ(a : Type)
    →   λ(b : Type)
    →   λ(f : a → b)
    →   λ(xs : List a)
    →   List/build
        b
        (   λ(list : Type)
        →   λ(cons : b → list → list)
        →   List/fold a xs list (λ(x : a) → cons (f x))
        )

in  map