JSTests/test262/test/built-ins/Array/prototype/entries/iteration.js

// Copyright (C) 2015 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-array.prototype.entries
description: >
  The return is a valid iterator with the array's numeric properties.
info: |
  22.1.3.4 Array.prototype.entries ( )

  1. Let O be ToObject(this value).
  2. ReturnIfAbrupt(O).
  3. Return CreateArrayIterator(O, "key+value").
---*/

var array = ['a', 'b', 'c'];
var iterator = array.entries();
var result;

result = iterator.next();
assert.sameValue(result.done, false, 'First result `done` flag');
assert.sameValue(result.value[0], 0, 'First result `value` (array key)');
assert.sameValue(result.value[1], 'a', 'First result `value` (array value)');
assert.sameValue(result.value.length, 2, 'First result `value` (length)');

result = iterator.next();
assert.sameValue(result.done, false, 'Second result `done` flag');
assert.sameValue(result.value[0], 1, 'Second result `value` (array key)');
assert.sameValue(result.value[1], 'b', 'Second result `value` (array value)');
assert.sameValue(result.value.length, 2, 'Second result `value` (length)');

result = iterator.next();
assert.sameValue(result.done, false, 'Third result `done` flag');
assert.sameValue(result.value[0], 2, 'Third result `value` (array key)');
assert.sameValue(result.value[1], 'c', 'Third result `value` (array value)');
assert.sameValue(result.value.length, 2, 'Third result `value` (length)');

result = iterator.next();
assert.sameValue(result.done, true, 'Exhausted result `done` flag');
assert.sameValue(result.value, undefined, 'Exhausted result `value`');