1/* 2 * Copyright (c) 2023-2025 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 16class Person { 17 name: String = "Bill"; 18} 19 20function dummy(): Person | null { 21 return null; 22} 23 24function main(): void { 25 let bill : Person = new Person(); 26 let name = bill.name; 27 28 assertEQ(name, "Bill") 29 assertEQ(name.length, 4) 30 31 name = bill.name; 32 assertEQ(name, "Bill") 33 34 let juan: Person | null = dummy(); 35 name = juan?.name ?? "Juan"; 36 assertEQ(name.length, 4) 37 38 let test = false; 39 40 assertTrue(juan?.name === undefined) 41} 42