tor-browser

The Tor Browser
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mapped-arguments-nonconfigurable-delete-4.js (795B)

      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. Arguments property is changed with
      9    [[Set]].
     10 flags: [noStrict]
     11 ---*/
     12 
     13 function argumentsAndDeleteSet(a) {
     14  Object.defineProperty(arguments, "0", {configurable: false});
     15 
     16  // Precondition: Delete is unsuccessful and doesn't affect mapping.
     17  assert.sameValue(delete arguments[0], false);
     18  assert.sameValue(a, 1);
     19  assert.sameValue(arguments[0], 1);
     20 
     21  arguments[0] = 2;
     22  assert.sameValue(a, 2);
     23  assert.sameValue(arguments[0], 2);
     24 }
     25 argumentsAndDeleteSet(1);
     26 
     27 reportCompare(0, 0);