Source code
Revision control
Copy as Markdown
Other Tools
// Copyright (C) 2017 Caio Lima. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
description: Mapped arguments property descriptor change to non-configurable, non-enumerable and non-writable
info: |
Change the descriptor using [[DefineOwnProperty]] to {configurable: false, enumerable: false},
set arguments[0] = 2 and then change property descriptor to {writable: false}.
The descriptor's enumerable property is the one set before the mapping removal.
flags: [noStrict]
esid: sec-arguments-exotic-objects-defineownproperty-p-desc
includes: [propertyHelper.js]
---*/
function fn(a) {
Object.defineProperty(arguments, "0", {configurable: false, enumerable: false});
arguments[0] = 2;
Object.defineProperty(arguments, "0", {writable: false});
assert.sameValue(a, 2);
verifyProperty(arguments, "0", {
value: 2,
writable: false,
enumerable: false,
configurable: false,
});
// Postcondition: Arguments mapping is removed.
a = 3;
verifyProperty(arguments, "0", {
value: 2,
writable: false,
enumerable: false,
configurable: false,
});
}
fn(1);
reportCompare(0, 0);