Source code
Revision control
Copy as Markdown
Other Tools
// Copyright (C) 2015 André Bargull. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
info: Mapped arguments object with non-configurable property
description: >
Mapped arguments property is changed to non-configurable and
non-writable. Perform property attribute changes with two
consecutive [[DefineOwnProperty]] calls. Mapped values are
unchanged, mapping itself is removed.
flags: [noStrict]
---*/
function argumentsNonConfigurableThenNonWritable(a) {
Object.defineProperty(arguments, "0", {configurable: false});
Object.defineProperty(arguments, "0", {writable: false});
assert.sameValue(a, 1);
assert.sameValue(arguments[0], 1);
// Postcondition: Arguments mapping is removed.
a = 2;
assert.sameValue(a, 2);
assert.sameValue(arguments[0], 1);
}
argumentsNonConfigurableThenNonWritable(1);
reportCompare(0, 0);