reviver-array-non-configurable-prop-delete.js (1325B)
1 // Copyright (C) 2019 Alexey Shvayka. All rights reserved. 2 // This code is governed by the BSD license found in the LICENSE file. 3 /*--- 4 esid: sec-internalizejsonproperty 5 description: > 6 [[Delete]] does not remove non-configurable properties. 7 If [[Delete]] is unsuccessful, no exception is thrown. 8 info: | 9 JSON.parse ( text [ , reviver ] ) 10 11 [...] 12 7. If IsCallable(reviver) is true, then 13 [...] 14 d. Return ? InternalizeJSONProperty(root, rootName). 15 16 InternalizeJSONProperty ( holder, name ) 17 18 1. Let val be ? Get(holder, name). 19 2. If Type(val) is Object, then 20 a. Let isArray be ? IsArray(val). 21 b. If isArray is true, then 22 [...] 23 iii. Repeat, while I < len, 24 1. Let newElement be ? InternalizeJSONProperty(val, ! ToString(I)). 25 2. If newElement is undefined, then 26 a. Perform ? val.[[Delete]](! ToString(I)). 27 28 OrdinaryDelete ( O, P ) 29 30 [...] 31 4. If desc.[[Configurable]] is true, then 32 a. Remove the own property with name P from O. 33 ---*/ 34 35 var json = '[1, 2]'; 36 var arr = JSON.parse(json, function(key, value) { 37 if (key === '0') { 38 Object.defineProperty(this, '1', {configurable: false}); 39 } 40 if (key === '1') return; 41 42 return value; 43 }); 44 45 assert.sameValue(arr[0], 1); 46 assert(arr.hasOwnProperty('1')); 47 assert.sameValue(arr[1], 2); 48 49 reportCompare(0, 0);