diff --git a/std/string/array/swap.lb b/std/string/array/swap.lb
new file mode 100644
index 0000000..583625f
--- /dev/null
+++ b/std/string/array/swap.lb
@@ -0,0 +1,21 @@
+@ 0 ; Get both arguments
+ args 0
+ size
+ #exec std/string/array/rev.lb
+
+ args 1
+ dup
+ ; |str_size str_size...>
+
+@ 1
+
+ kjz 2
+ #expr -
+ args 1
+ #exec std/rot.lb
+ #exec std/rot.lb
+ jmp 1
+
+@ 2
+ pop
+ #exec std/string/array/rev.lb