| // 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.keys |
| description: > |
| The return is a valid iterator with the array's numeric properties. |
| info: | |
| 22.1.3.13 Array.prototype.keys ( ) |
| |
| 1. Let O be ToObject(this value). |
| 2. ReturnIfAbrupt(O). |
| 3. Return CreateArrayIterator(O, "key"). |
| ---*/ |
| |
| var array = ['a', 'b', 'c']; |
| var iterator = array.keys(); |
| var result; |
| |
| result = iterator.next(); |
| assert.sameValue(result.value, 0, 'First result `value`'); |
| assert.sameValue(result.done, false, 'First result `done` flag'); |
| |
| result = iterator.next(); |
| assert.sameValue(result.value, 1, 'Second result `value`'); |
| assert.sameValue(result.done, false, 'Second result `done` flag'); |
| |
| result = iterator.next(); |
| assert.sameValue(result.value, 2, 'Third result `value`'); |
| assert.sameValue(result.done, false, 'Third result `done` flag'); |
| |
| result = iterator.next(); |
| assert.sameValue(result.value, undefined, 'Exhausted result `value`'); |
| assert.sameValue(result.done, true, 'Exhausted result `done` flag'); |