1/* Copyright JS Foundation and other contributors, http://js.foundation 2 * 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 16var s1 = Symbol(); 17var s2 = Symbol(); 18var obj = {}; 19 20obj[s1] = 1; 21Object.seal(obj); 22 23obj[s1] = 2; 24obj[s2] = 3 25 26assert(obj[s1] === 2); 27assert(obj[s2] === undefined); 28assert(delete obj[s1] === false); 29