1/* 2 * Copyright (c) 2023 - 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 16class A { 17 bar(): string { 18 return "Class A"; 19 } 20} 21 22class B extends A {} 23 24class C extends B { 25 bar(): string { 26 return "Class C"; 27 } 28} 29 30function foo(c: Int|String|A|null|undefined): void { 31 if (c instanceof String) { 32 assertEQ(c.length, 11) 33 } else if (c instanceof C) { 34 assertEQ(c.bar(), "Class C") 35 } else if (c instanceof Int) { 36 assertEQ(c * c, 49) 37 } else if (c === undefined) { 38 assertEQ(c, undefined) 39 } else { 40 assertEQ(c, null) 41 } 42} 43 44function main(): void { 45 foo("Test string"); 46 foo(new Int(7)); 47 foo(new C()); 48 foo(null); 49 foo(undefined); 50} 51