| // Copyright (C) 2013 the V8 project authors. All rights reserved. |
| // This code is governed by the BSD license found in the LICENSE file. |
| /*--- |
| es6id: 25.2 |
| description: > |
| When the `next` method of a generator-produced iterable is invoked without |
| an argument, the corresponding `yield` expression should be evaluated as |
| `undefined`. |
| features: [generators] |
| ---*/ |
| |
| function* g() { actual = yield; } |
| var expected = {}; |
| var iter = g(); |
| var actual, result; |
| |
| result = iter.next(); |
| assert.sameValue(result.value, undefined, 'First result `value`'); |
| assert.sameValue(result.done, false, 'First result `done` flag'); |
| assert.sameValue( |
| actual, undefined, 'Value of `yield` expression (prior to continuation)' |
| ); |
| |
| result = iter.next(expected); |
| assert.sameValue(result.value, undefined, 'Second result `value`'); |
| assert.sameValue(result.done, true, 'Second result `done` flag'); |
| assert.sameValue( |
| actual, expected, 'Value of `yield` expression (following continuation)' |
| ); |
