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 16/*--- 17 desc: 10.04.Interface_Members 18 name: 10.Interfaces/10.04.Interface_Members/interface_with_optional_attributes_0000.sts 19 tags: 20 ---*/ 21 22interface IStudent { 23 name: string; 24 age?: int | undefined; 25} 26 27class Student implements IStudent{ 28 name: string; 29 age?: int | undefined; 30 31 constructor(name: string, age: int) { 32 this.name = name; 33 this.age = age; 34 } 35 36 constructor(name: string) { 37 this.name = name; 38 } 39} 40 41function main() : void { 42 let s : Student = new Student("Klara", 18); 43 let s1 : Student = new Student("Karl"); 44 45 assert s.name == "Klara" 46 assert s.age == 18 47 assert s1.name == "Karl" 48 assert s1.age == undefined 49} 50