forked from xuos/xiuos
30 lines
1.1 KiB
JavaScript
30 lines
1.1 KiB
JavaScript
// Copyright JS Foundation and other contributors, http://js.foundation
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
// New objects are extensible.
|
|
var empty = {};
|
|
assert (Object.isExtensible(empty) === true);
|
|
|
|
// ...but that can be changed.
|
|
Object.preventExtensions(empty);
|
|
assert(Object.isExtensible(empty) === false);
|
|
|
|
// Sealed objects are by definition non-extensible.
|
|
var sealed = Object.seal({});
|
|
assert (Object.isExtensible(sealed) === false);
|
|
|
|
// Frozen objects are also by definition non-extensible.
|
|
var frozen = Object.freeze({});
|
|
assert(Object.isExtensible(frozen) === false);
|