diff --git a/dataext/stack.go b/dataext/stack.go
index 6211334..d25d653 100644
--- a/dataext/stack.go
+++ b/dataext/stack.go
@@ -96,3 +96,12 @@ func (s *Stack[T]) OptPeek() *T {
 
 	return langext.Ptr(s.data[l-1])
 }
+
+func (s *Stack[T]) Length() int {
+	if s.lock != nil {
+		s.lock.Lock()
+		defer s.lock.Unlock()
+	}
+
+	return len(s.data)
+}