1 files changed, 9 insertions, 0 deletions
diff --git a/transfer/lib/array.tr b/transfer/lib/array.tr
new file mode 100644
index 000000000..e91fe35e7
--- /dev/null
+++ b/transfer/lib/array.tr
@@ -0,0 +1,9 @@
+import nat
+
+data Array : Type -> Nat -> Type where
+   Empty : (A:Type) -> Array A Zero
+   Cell : (A:Type) -> (n:Nat) -> A -> Array A n -> Array A (Succ n)
+
+mapA : (A:Type) -> (B:Type) -> (n:Nat) -> (A -> B) -> Array A n -> Array B n
+mapA A B _ f (Empty _) = Empty B
+mapA A B (Succ n) f (Cell _ _ x xs) = Cell B n (f x) (mapA A B n f xs)