Source code
Revision control
Copy as Markdown
Other Tools
// Copyright (c) 2012 Ecma International. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
info: |
Step 4 of defineProperty calls the [[DefineOwnProperty]] internal method
of O to define the property. For non-configurable properties, step 11.a.i
of [[DefineOwnProperty]] permits setting a setter (if absent).
es5id: 15.2.3.6-4-19
description: >
Object.defineProperty permits setting a setter (if absent) of
non-configurable accessor properties(8.12.9 step 10.a.ii.1)
---*/
var o = {};
// create an accessor property; all other attributes default to false.
// dummy getter
var getter = function() {
return 1;
}
var d1 = {
get: getter
};
Object.defineProperty(o, "foo", d1);
// now, trying to set the setter should succeed even though [[Configurable]]
// on the original property will be false.
var desc = {
set: undefined
};
Object.defineProperty(o, "foo", desc);
var d2 = Object.getOwnPropertyDescriptor(o, "foo");
assert.sameValue(d2.get, getter, 'd2.get');
assert.sameValue(d2.set, undefined, 'd2.set');
assert.sameValue(d2.configurable, false, 'd2.configurable');
assert.sameValue(d2.enumerable, false, 'd2.enumerable');
reportCompare(0, 0);