1/* 2 * Copyright (c) 2024-2025 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 16function func<T>(x: T, key?: (a: T) => int) { 17 let a = () => { 18 return key ? key!(x): 0; 19 } 20 return a(); 21} 22 23function callback(cb: () => void) { 24 cb(); 25} 26 27class A<T> { 28 value?: T; 29 30 update(val?: T): void { 31 if (val === undefined) return; 32 const updateValue = val 33 callback(() => { 34 const a = updateValue; 35 this.value = a 36 }); 37 } 38} 39 40function main() { 41 let x = (a: int) => { return a + 1; }; 42 assertEQ(func<int>(10, x), 11) 43 assertEQ(func<int>(10, undefined), 0) 44 45 let a = new A<int>; 46 a.update(undefined); 47 assertTrue(a.value === undefined) 48 a.update(48); 49 assertEQ(a.value, 48) 50} 51