tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
Log | Files | Refs | README | LICENSE

mapped-arguments-nonconfigurable-strict-delete-4.js (929B)

      1 // Copyright (C) 2015 André Bargull. All rights reserved.
      2 // This code is governed by the BSD license found in the LICENSE file.
      3 
      4 /*---
      5 info: Mapped arguments object with non-configurable property
      6 description: >
      7    Mapping works when property is non-configurable, arguments property
      8    was not deleted. [[Delete]] operations throws TypeError if called
      9    from strict-mode code. Arguments property is changed with [[Set]].
     10 flags: [noStrict]
     11 ---*/
     12 
     13 function argumentsAndStrictDeleteSet(a) {
     14  Object.defineProperty(arguments, "0", {configurable: false});
     15 
     16  // Precondition: Delete is unsuccessful and doesn't affect mapping.
     17  var args = arguments;
     18  assert.throws(TypeError, function() { "use strict"; delete args[0]; });
     19  assert.sameValue(a, 1);
     20  assert.sameValue(arguments[0], 1);
     21 
     22  arguments[0] = 2;
     23  assert.sameValue(a, 2);
     24  assert.sameValue(arguments[0], 2);
     25 }
     26 argumentsAndStrictDeleteSet(1);
     27 
     28 reportCompare(0, 0);