1/* Copyright JS Foundation and other contributors, http://js.foundation
2 *
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 NoParent {
17  static [Symbol.hasInstance] (arg) {
18    return false;
19  }
20}
21
22var obj = new NoParent ();
23
24assert ((obj instanceof NoParent) === false);
25
26class PositiveNumber {
27  static [Symbol.hasInstance] (arg) {
28    return (arg instanceof Number) && (arg >= 0);
29  }
30}
31
32var num_a = new Number (33);
33var num_b = new Number (-50);
34
35assert ((num_a instanceof PositiveNumber) === true);
36assert ((num_b instanceof PositiveNumber) === false);
37
38
39class ErrorAlways {
40  static [Symbol.hasInstance] (arg) {
41    throw new URIError("ErrorAlways");
42  }
43}
44
45try {
46  (new Object ()) instanceof ErrorAlways;
47  assert (false);
48} catch (ex) {
49  assert (ex instanceof URIError);
50}
51