/*
 * Copyright (c) 2023-2024 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

class Person {
    name: String = "Bill";
}

function dummy(): Person | null {
    return null;
}

function main(): void {
  let bill : Person = new Person();
  let name = bill.name;

  assert(name == "Bill");
  assert(name.length == 4);

  name = bill.name;
  assert(name == "Bill");

  let juan: Person | null = dummy();
  name = juan?.name ?? "Juan";
  assert (name.length == 4);

  let test = false;

  assert(juan?.name === undefined);
}