test262/test/language/statements/for-of/map.js

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// Copyright (C) 2015 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
description: Map traversal using for..of
info: |
Map instances should be able to be traversed using a `for...of` loop.
es6id: 13.6.4
features: [Map]
---*/
var map = new Map();
var obj = {};
var iterationCount = 0;
var first = [0, 'a'];
var second = [true, false];
var third = [null, undefined];
var fourth = [NaN, obj];
map.set(0, 'a');
map.set(true, false);
map.set(null, undefined);
map.set(NaN, obj);
for (var x of map) {
assert.sameValue(x[0], first[0]);
assert.sameValue(x[1], first[1]);
first = second;
second = third;
third = fourth;
fourth = null;
iterationCount += 1;
}
assert.sameValue(iterationCount, 4);