diff --git a/datastructure/arraystack.go b/datastructure/arraystack.go
index 87d5560..e96e569 100644
--- a/datastructure/arraystack.go
+++ b/datastructure/arraystack.go
@@ -18,8 +18,8 @@ func (s *ArrayStack[T]) Data() []T {
 	return s.data
 }
 
-// Length return length of stack data
-func (s *ArrayStack[T]) Length() int {
+// Size return length of stack data
+func (s *ArrayStack[T]) Size() int {
 	return s.length
 }
 
diff --git a/datastructure/arraystack_test.go b/datastructure/arraystack_test.go
index 8fe6196..1e55ceb 100644
--- a/datastructure/arraystack_test.go
+++ b/datastructure/arraystack_test.go
@@ -16,7 +16,7 @@ func TestArrayStack_Push(t *testing.T) {
 
 	expected := []int{3, 2, 1}
 	values := stack.Data()
-	length := stack.Length()
+	length := stack.Size()
 
 	assert.Equal(expected, values)
 	assert.Equal(3, length)
@@ -65,13 +65,13 @@ func TestArrayStack_Empty(t *testing.T) {
 
 	stack := NewArrayStack[int]()
 	assert.Equal(true, stack.IsEmpty())
-	assert.Equal(0, stack.Length())
+	assert.Equal(0, stack.Size())
 
 	stack.Push(1)
 	assert.Equal(false, stack.IsEmpty())
-	assert.Equal(1, stack.Length())
+	assert.Equal(1, stack.Size())
 
 	stack.EmptyStack()
 	assert.Equal(true, stack.IsEmpty())
-	assert.Equal(0, stack.Length())
+	assert.Equal(0, stack.Size())
 }