mirror of
https://github.com/jerryscript-project/jerryscript.git
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0511091e8a
Since the project is now hosted at the JS Foundation we can move to unified copyright notices for the project. Starting with this commit all future contributions to the project should only carry the following copyright notice (except for third-party code which requires copyright information to be preserved): "Copyright JS Foundation and other contributors, http://js.foundation" (without the quotes) This avoids cluttering the codebase with contributor-specific copyright notices which have a higher maintenance overhead and tend to get outdated quickly. Also dropping the year from the copyright notices helps to avoid yearly code changes just to update the copyright notices. Note that each contributor still retains full copyright ownership of his/her contributions and the respective authorship is tracked very accurately via Git. JerryScript-DCO-1.0-Signed-off-by: Tilmann Scheller t.scheller@samsung.com
86 lines
2.7 KiB
JavaScript
86 lines
2.7 KiB
JavaScript
// Copyright JS Foundation and other contributors, http://js.foundation
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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var obj = {
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prop: function() {},
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foo: 'bar'
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};
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// New properties may be added, existing properties may be changed or removed.
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obj.foo = 'baz';
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obj.lumpy = 'woof';
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delete obj.prop;
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var o = Object.seal(obj);
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assert (o === obj);
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assert (Object.isSealed (obj) === true);
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// Changing property values on a sealed object still works.
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obj.foo = 'quux';
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assert (obj.foo === 'quux');
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// But you can't convert data properties to accessors, or vice versa.
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try {
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Object.defineProperty(obj, 'foo', { get: function() { return 42; } }); // throws a TypeError
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assert (false);
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} catch (e) {
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assert (e instanceof TypeError);
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}
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// Now any changes, other than to property values, will fail.
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obj.quaxxor = 'the friendly duck'; // silently doesn't add the property
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delete obj.foo; // silently doesn't delete the property
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assert (obj.quaxxor === undefined);
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assert (obj.foo === 'quux')
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try {
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// Attempted additions through Object.defineProperty will also throw.
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Object.defineProperty (obj, 'ohai', { value: 17 }); // throws a TypeError
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assert (false);
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} catch (e) {
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assert (e instanceof TypeError);
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}
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try {
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Object.defineProperties (obj, { 'ohai' : { value: 17 } });
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assert (false);
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} catch (e) {
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assert (e instanceof TypeError);
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}
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Object.defineProperty (obj, 'foo', { value: 'eit' });
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assert (obj.foo === 'eit')
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// Objects aren't sealed by default.
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var empty = {};
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assert (Object.isSealed (empty) === false);
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// If you make an empty object non-extensible, it is vacuously sealed.
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Object.preventExtensions (empty);
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assert (Object.isSealed (empty) === true);
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// The same is not true of a non-empty object, unless its properties are all non-configurable.
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var hasProp = { fee: 'fie foe fum' };
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Object.preventExtensions (hasProp);
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assert (Object.isSealed (hasProp) === false);
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// But make them all non-configurable and the object becomes sealed.
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Object.defineProperty (hasProp, 'fee', { configurable: false });
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assert (Object.isSealed (hasProp) === true);
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// The easiest way to seal an object, of course, is Object.seal.
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var sealed = {};
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Object.seal (sealed);
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assert (Object.isSealed (sealed) === true);
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