tor-browser

The Tor Browser
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toobject_before_topropertykey.js (1157B)

      1 // Copyright (C) 2021 Jamie Kyle.  All rights reserved.
      2 // This code is governed by the BSD license found in the LICENSE file.
      3 /*---
      4 esid: sec-object.hasown
      5 description: >
      6  ToObject is performed before ToPropertyKey.
      7 info: |
      8  Object.hasOwn ( _O_, _P_ )
      9 
     10  1. Let _obj_ be ? ToObject(_O_).
     11  2. Let _key_ be ? ToPropertyKey(_P_).
     12 
     13  ToPropertyKey ( argument )
     14 
     15  1. Let key be ? ToPrimitive(argument, hint String).
     16 author: Jamie Kyle
     17 features: [Symbol.toPrimitive, Object.hasOwn]
     18 ---*/
     19 
     20 var callCount1 = 0;
     21 var coercibleKey1 = {
     22  get toString() {
     23    callCount1++;
     24    throw new Test262Error();
     25  },
     26  get valueOf() {
     27    callCount1++;
     28    throw new Test262Error();
     29  },
     30 };
     31 
     32 assert.throws(TypeError, function() {
     33  Object.hasOwn(null, coercibleKey1);
     34 });
     35 assert.sameValue(callCount1, 0, "toString and valueOf must not be called");
     36 
     37 
     38 var callCount2 = 0;
     39 var coercibleKey2 = {};
     40 coercibleKey2[Symbol.toPrimitive] = function() {
     41  callCount2++;
     42  throw new Test262Error();
     43 };
     44 
     45 assert.throws(TypeError, function() {
     46  Object.hasOwn(undefined, coercibleKey2);
     47 });
     48 assert.sameValue(callCount2, 0, "Symbol.toPrimitive must not be called");
     49 
     50 reportCompare(0, 0);