1 files changed, 6 insertions, 0 deletions
diff --git a/ds/arraylist.go b/ds/arraylist.go
index 65c42ef..243efe1 100644
--- a/ds/arraylist.go
+++ b/ds/arraylist.go
@@ -35,3 +35,9 @@ func (a ArrayList) Sorted() bool {
 	}
 	return true
 }
+
+func (a ArrayList) Swap(i, j int) {
+    tmp := a[i]
+    a[i] = a[j]
+    a[j] = tmp
+}