15.2.3.6-4-15.js (1329B)
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 info: | 6 Step 4 of defineProperty calls the [[DefineOwnProperty]] internal method 7 of O to define the property. For configurable properties, step 9c of 8 [[DefineOwnProperty]] permits changing the kind of a property. 9 es5id: 15.2.3.6-4-15 10 description: > 11 Object.defineProperty permits changing accessor property to data 12 property for configurable properties 13 ---*/ 14 15 var o = {}; 16 17 // define an accessor property 18 // dummy getter 19 var getter = function() { 20 return 1; 21 } 22 var d1 = { 23 get: getter, 24 configurable: true 25 }; 26 Object.defineProperty(o, "foo", d1); 27 28 // changing "foo" to be a data valued property should succeed, since 29 // [[Configurable]] on the original property will be true. Existing 30 // values of [[Configurable]] and [[Enumerable]] need to be preserved 31 // and the rest need to be set to their default values. 32 var desc = { 33 value: 101 34 }; 35 Object.defineProperty(o, "foo", desc); 36 var d2 = Object.getOwnPropertyDescriptor(o, "foo"); 37 38 assert.sameValue(d2.value, 101, 'd2.value'); 39 assert.sameValue(d2.writable, false, 'd2.writable'); 40 assert.sameValue(d2.enumerable, false, 'd2.enumerable'); 41 assert.sameValue(d2.configurable, true, 'd2.configurable'); 42 43 reportCompare(0, 0);