1/*
2 * Copyright (c) 2024 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16let instance;
17class A {
18  name = ''
19  getName() {
20    return this.name;
21  }
22  setName(name) {
23    this.name = name;
24  }
25}
26
27class B extends A {
28  constructor (...args) {
29    if (!instance) {
30      instance = super(...args);
31    }
32    return instance;
33  }
34}
35
36let a = new B();
37let b = new B();
38
39a.setName('aaa');
40print(b.getName());
41