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// New objects are extensible.
16var empty = {};
17assert (Object.isExtensible(empty) === true);
18
19// ...but that can be changed.
20Object.preventExtensions(empty);
21assert(Object.isExtensible(empty) === false);
22
23// Sealed objects are by definition non-extensible.
24var sealed = Object.seal({});
25assert (Object.isExtensible(sealed) === false);
26
27// Frozen objects are also by definition non-extensible.
28var frozen = Object.freeze({});
29assert(Object.isExtensible(frozen) === false);
30