JSTests/test262/test/built-ins/JSON/parse/reviver-array-non-configurable-prop-delete.js

// Copyright (C) 2019 Alexey Shvayka. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-internalizejsonproperty
description: >
  [[Delete]] does not remove non-configurable properties.
  If [[Delete]] is unsuccessful, no exception is thrown.
info: |
  JSON.parse ( text [ , reviver ] )

  [...]
  7. If IsCallable(reviver) is true, then
    [...]
    d. Return ? InternalizeJSONProperty(root, rootName).

  InternalizeJSONProperty ( holder, name )

  1. Let val be ? Get(holder, name).
  2. If Type(val) is Object, then
    a. Let isArray be ? IsArray(val).
    b. If isArray is true, then
      [...]
      iii. Repeat, while I < len,
        1. Let newElement be ? InternalizeJSONProperty(val, ! ToString(I)).
        2. If newElement is undefined, then
          a. Perform ? val.[[Delete]](! ToString(I)).

  OrdinaryDelete ( O, P )

  [...]
  4. If desc.[[Configurable]] is true, then
    a. Remove the own property with name P from O.
---*/

var json = '[1, 2]';
var arr = JSON.parse(json, function(key, value) {
  if (key === '0') {
    Object.defineProperty(this, '1', {configurable: false});
  }
  if (key === '1') return;

  return value;
});

assert.sameValue(arr[0], 1);
assert(arr.hasOwnProperty('1'));
assert.sameValue(arr[1], 2);