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1/*
2 * Copyright (c) 2022-2025 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
16/*---
17desc: 09.classes/constructor-inheritance
18tags: []
19---*/
20
21 type NullableString = String|null;
22
23 class Base {
24    name: NullableString;
25    constructor(param: NullableString) {
26        this.name = param;
27    }
28 }
29
30 class Derive extends Base {}
31
32 function main(): void {
33    let b = new Derive();
34    assertEQ( b.name, null)
35
36    b = new Derive("Hello");
37    assertEQ( b.name, "Hello")
38 }
39