diff --git a/unitauto/method_util.go b/unitauto/method_util.go
index f24494c..b5b39f8 100644
--- a/unitauto/method_util.go
+++ b/unitauto/method_util.go
@@ -2376,9 +2376,12 @@ func cast(obj any, typ reflect.Type) (any, error) {
 	}
 
 	if IsMapType(typ.String()) {
-		var s = fmt.Sprint(obj)
+		var b, err = json.Marshal(obj)
+		if err != nil {
+			var s = fmt.Sprintf("%q\n", obj)
+			b = []byte(s)
+		}
 
-		var b = []byte(s)
 		var m = map[string]any{}
 		if err := json.Unmarshal(b, m); err != nil {
 			return nil, err
@@ -2401,9 +2404,12 @@ func cast(obj any, typ reflect.Type) (any, error) {
 
 	var al = 0
 	if IsArrType(typ.String()) {
-		var s = fmt.Sprint(obj)
+		var b, err = json.Marshal(obj)
+		if err != nil {
+			var s = fmt.Sprintf("%q\n", obj)
+			b = []byte(s)
+		}
 
-		var b = []byte(s)
 		var a []any
 		if err := json.Unmarshal(b, &a); err != nil {
 			return nil, err
diff --git a/unitauto/server.go b/unitauto/server.go
index 1511d74..1cc96a3 100644
--- a/unitauto/server.go
+++ b/unitauto/server.go
@@ -34,6 +34,16 @@ func Init() {
 	CLASS_MAP["unitauto.test.Minus"] = test.Minus
 	CLASS_MAP["unitauto.test.Multiply"] = test.Multiply
 	CLASS_MAP["unitauto.test.Divide"] = test.Divide
+	CLASS_MAP["unitauto.test.Len"] = test.Len
+	CLASS_MAP["unitauto.test.Index"] = test.Index
+	CLASS_MAP["unitauto.test.GetByIndex"] = test.GetByIndex[any]
+	CLASS_MAP["unitauto.test.GetByIndex[int]"] = test.GetByIndex[int]
+	CLASS_MAP["unitauto.test.GetByIndex[float64]"] = test.GetByIndex[float64]
+	CLASS_MAP["unitauto.test.GetByIndex[string]"] = test.GetByIndex[string]
+	CLASS_MAP["unitauto.test.SetByIndex"] = test.SetByIndex[any]
+	CLASS_MAP["unitauto.test.SetByIndex[int]"] = test.SetByIndex[int]
+	CLASS_MAP["unitauto.test.SetByIndex[float64]"] = test.SetByIndex[float64]
+	CLASS_MAP["unitauto.test.SetByIndex[string]"] = test.SetByIndex[string]
 	CLASS_MAP["unitauto.test.ComputeAsync"] = test.ComputeAsync
 	CLASS_MAP["unitauto.test.New"] = test.New
 	CLASS_MAP["unitauto.test.Compare"] = test.Compare
@@ -53,6 +63,16 @@ func Init() {
 	CLASS_MAP["test.Minus"] = test.Minus
 	CLASS_MAP["test.Multiply"] = test.Multiply
 	CLASS_MAP["test.Divide"] = test.Divide
+	CLASS_MAP["test.Len"] = test.Len
+	CLASS_MAP["test.Index"] = test.Index
+	CLASS_MAP["test.GetByIndex"] = test.GetByIndex[any]
+	CLASS_MAP["test.GetByIndex[int]"] = test.GetByIndex[int]
+	CLASS_MAP["test.GetByIndex[float64]"] = test.GetByIndex[float64]
+	CLASS_MAP["test.GetByIndex[string]"] = test.GetByIndex[string]
+	CLASS_MAP["test.SetByIndex"] = test.SetByIndex[any]
+	CLASS_MAP["test.SetByIndex[int]"] = test.SetByIndex[int]
+	CLASS_MAP["test.SetByIndex[float64]"] = test.SetByIndex[float64]
+	CLASS_MAP["test.SetByIndex[string]"] = test.SetByIndex[string]
 	CLASS_MAP["test.TestGeneric"] = test.TestGeneric[float64, float64]
 	CLASS_MAP["test.TestGeneric[int,int]"] = test.TestGeneric[int, int]
 	CLASS_MAP["test.TestGeneric[int,float64]"] = test.TestGeneric[int, float64]
diff --git a/unitauto/test/test_util.go b/unitauto/test/test_util.go
index 56131b0..706c282 100644
--- a/unitauto/test/test_util.go
+++ b/unitauto/test/test_util.go
@@ -26,6 +26,46 @@ func Divide(a int, b int) float64 {
 	return float64(a) / float64(b)
 }
 
+func Len(arr []int) int {
+	if arr == nil {
+		return 0
+	}
+	return len(arr)
+}
+
+func Index(arr []any, item any) int {
+	l := len(arr)
+	if l <= 0 {
+		return -1
+	}
+
+	for i := 0; i < l; i++ {
+		if arr[i] == item {
+			return i
+		}
+	}
+
+	return -1
+}
+
+func GetByIndex[T any](arr []T, index int) *T {
+	l := len(arr)
+	if l <= 0 || l <= index {
+		return nil
+	}
+
+	return &arr[index]
+}
+
+func SetByIndex[T any](arr []T, index int, item T) {
+	l := len(arr)
+	if l <= 0 || l <= index {
+		return
+	}
+
+	arr[index] = item
+}
+
 func TestGeneric[T int | int8 | int16 | int32 | int64 | uint | uint8 | uint16 | uint32 | uint64 | float32 | float64, R int | float64](a T, b R) float64 {
 	return float64(a) + float64(b)
 }