| // Copyright 2017 the V8 project authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| const key1 = {}; |
| const key2 = {}; |
| |
| const set = new Set([, 1]); |
| assertEquals(set.has(undefined), true); |
| assertEquals(set.has(1), true); |
| |
| const doubleSet = new Set([,1.234]); |
| assertEquals(doubleSet.has(undefined), true); |
| assertEquals(doubleSet.has(1.234), true); |
| |
| const map = new Map([[, key1], [key2, ]]); |
| assertEquals(map.get(undefined), key1); |
| assertEquals(map.get(key2), undefined); |
| |
| const doublesMap = new Map([[, 1.234]]); |
| assertEquals(doublesMap.get(undefined), 1.234); |
| |
| const weakmap = new WeakMap([[key1, ]]); |
| assertEquals(weakmap.get(key1), undefined); |
| |
| assertThrows(() => new WeakSet([, {}])); |
| assertThrows(() => new WeakSet([, 1.234])); |
| assertThrows(() => new Map([, [, key1]])); |
| assertThrows(() => new WeakMap([[, key1]])); |
| assertThrows(() => new WeakMap([, [, key1]])); |
