1 files changed, 21 insertions, 0 deletions
diff --git a/algebraic-structs.foldable.vector.base.scm b/algebraic-structs.foldable.vector.base.scm
new file mode 100644
index 0000000..0c5af89
--- /dev/null
+++ b/algebraic-structs.foldable.vector.base.scm
@@ -0,0 +1,21 @@
+(module (algebraic-structs foldable vector base) (foldl foldr)
+  (import scheme
+          (only (chicken base) add1 sub1))
+
+  (define (foldl f z v)
+    (let ((len (vector-length v)))
+      (let loop ((i 0)
+                 (acc z))
+        (if (= i len)
+            acc
+            (loop (add1 i)
+                  (f acc (vector-ref v i)))))))
+
+  (define (foldr f z v)
+    (let ((len (vector-length v)))
+      (let loop ((i (sub1 len))
+                 (acc z))
+        (if (< i 0)
+            acc
+            (loop (sub1 i)
+                  (f (vector-ref v i) acc)))))))