tor-browser

The Tor Browser
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lgcl-or-assignment-operator-non-extensible-strict.js (687B)

      1 'use strict';
      2 // Copyright (c) 2020 Ecma International.  All rights reserved.
      3 // This code is governed by the BSD license found in the LICENSE file.
      4 
      5 /*---
      6 esid: sec-assignment-operators-runtime-semantics-evaluation
      7 description: >
      8    Strict Mode - TypeError is thrown if The LeftHandSide of a Logical
      9    Assignment operator(||=) is a reference to a non-existent property
     10    of an object whose [[Extensible]] internal property is false.
     11 flags: [onlyStrict]
     12 features: [logical-assignment-operators]
     13 
     14 ---*/
     15 
     16 var obj = {};
     17 Object.preventExtensions(obj);
     18 
     19 assert.throws(TypeError, function() {
     20  obj.prop ||= 1;
     21 });
     22 assert.sameValue(obj.prop, undefined, "obj.prop");
     23 
     24 reportCompare(0, 0);