15.2.3.7-6-a-119.js (673B)
1 // Copyright (c) 2012 Ecma International. All rights reserved. 2 // This code is governed by the BSD license found in the LICENSE file. 3 4 /*--- 5 es5id: 15.2.3.7-6-a-119 6 description: > 7 Object.defineProperties - 'O' is an Array, 'P' is the length 8 property of 'O', the [[Value]] field of 'desc' is absent, test 9 TypeError is thrown when updating the [[Writable]] attribute of 10 the length property from false to true (15.4.5.1 step 3.a.i) 11 ---*/ 12 13 var arr = []; 14 15 Object.defineProperty(arr, "length", { 16 writable: false 17 }); 18 assert.throws(TypeError, function() { 19 Object.defineProperties(arr, { 20 length: { 21 writable: true 22 } 23 }); 24 }); 25 26 reportCompare(0, 0);