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 callbackNoArgVoid(callback: () => void): void { 17 callback(); 18} 19 20function callbackNoArgInt(callback: () => int): void { 21 let x: int = callback(); 22} 23 24function callbackIntStringBool(callback: (x: int, y: String) => boolean): void { 25 let x: boolean = callback(5, "Hello"); 26} 27 28function main(): void { 29 callbackNoArgVoid((): void => { 30 console.println("hello"); 31 }); 32 callbackNoArgVoid(() => { 33 console.println("hello"); 34 }); 35 36 callbackNoArgInt((): int => { 37 return new String("hello").length as int; 38 }); 39 callbackNoArgInt(() => { 40 return new String("hello").length as int; 41 }); 42 43 callbackIntStringBool((x: int, y: String): boolean => { 44 return y.length == x; 45 }); 46 callbackIntStringBool((x, y) => { 47 return y.length == x; 48 }); 49} 50