JSTests/test262/test/language/statements/for-of/int8array-mutate.js

// Copyright (C) 2015 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
es6id: 13.6.4
description: Int8Array mutation during traversal using for..of
info: >
    Int8Array instances should be able to be traversed using a `for..of` loop,
    and dynamic changes to their contents should be reflected in the iterated
    values.
features: [TypedArray]
---*/

var iterationCount = 0;
var array = new Int8Array([3, 2, 4, 1]);

var first = 3;
var second = 64;
var third = 4;
var fourth = 1;

for (var x of array) {
  assert.sameValue(x, first);

  first = second;
  second = third;
  third = fourth;
  fourth = null;

  array[1] = 64;

  iterationCount += 1;
}

assert.sameValue(iterationCount, 4);