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
16function fooAnd(x: String|null, y: String|null): string {
17  if (x != null && y != null)  {
18    return x + " " + y;
19  } else if (x == null && y == null) {
20    return "null";
21  } else if (x != null && y == null) {
22    return x;
23  } else if (x == null && y != null) {
24     return y;
25  } else {
26     throw new Error("Unreachable");
27  }
28}
29
30function fooOr1(x: String|null, y: String|null): string {
31  if (x != null || y != null)  {
32    return "case 1";
33  } else if (x == null && y == null) {
34    return "null";
35  } else {
36     throw new Error("Unreachable");
37  }
38}
39
40function fooOr2(x: String|null, y: String|null): string {
41  if (x == null || y == null)  {
42    return "case 1";
43  } else if (x != null && y != null) {
44    return x + " " + y;
45  } else {
46     throw new Error("Unreachable");
47  }
48}
49
50function main(): void {
51  assert(fooAnd("Test", "string") == "Test string");
52  assert(fooAnd("Test", null) == "Test");
53  assert(fooAnd(null, "string") == "string");
54  assert(fooAnd(null, null) == "null");
55
56  assert(fooOr1("Test", "string") == "case 1");
57  assert(fooOr1("Test", null) == "case 1");
58  assert(fooOr1(null, "string") == "case 1");
59  assert(fooOr1(null, null) == "null");
60
61  assert(fooOr2("Test", "string") == "Test string");
62  assert(fooOr2("Test", null) == "case 1");
63  assert(fooOr2(null, "string") == "case 1");
64  assert(fooOr2(null, null) == "case 1");
65}
66