js/src/tests/ecma_6/Generators/delegating-yield-8.js@6474c204b198 (annotated)
js/src/tests/ecma_6/Generators/delegating-yield-8.js
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | // Test that yield* can appear in a loop, and alongside yield. |
| michael@0 | 2 | |
| michael@0 | 3 | function* countdown(n) { |
| michael@0 | 4 | while (n > 0) { |
| michael@0 | 5 | yield n; |
| michael@0 | 6 | yield* countdown(--n); |
| michael@0 | 7 | } |
| michael@0 | 8 | return 34; |
| michael@0 | 9 | } |
| michael@0 | 10 | |
| michael@0 | 11 | function collect_results(iter) { |
| michael@0 | 12 | var ret = []; |
| michael@0 | 13 | var result; |
| michael@0 | 14 | do { |
| michael@0 | 15 | result = iter.next(); |
| michael@0 | 16 | ret.push(result); |
| michael@0 | 17 | } while (!result.done); |
| michael@0 | 18 | return ret; |
| michael@0 | 19 | } |
| michael@0 | 20 | |
| michael@0 | 21 | var expected = [ |
| michael@0 | 22 | // yield in countdown(3), n == 3 |
| michael@0 | 23 | {value: 3, done: false}, |
| michael@0 | 24 | // yield in yield* countdown(2), n == 2 |
| michael@0 | 25 | {value: 2, done: false}, |
| michael@0 | 26 | // yield in nested yield* countdown(1), n == 1 |
| michael@0 | 27 | {value: 1, done: false}, |
| michael@0 | 28 | // countdown(0) yields no values |
| michael@0 | 29 | // second go-through of countdown(2) loop, n == 1 |
| michael@0 | 30 | {value: 1, done: false}, |
| michael@0 | 31 | // second go-through of countdown(3) loop, n == 2 |
| michael@0 | 32 | {value: 2, done: false}, |
| michael@0 | 33 | // yield in yield* countdown(1), n == 1 |
| michael@0 | 34 | {value: 1, done: false}, |
| michael@0 | 35 | // third go-through of countdown(3) loop, n == 1 |
| michael@0 | 36 | {value: 1, done: false}, |
| michael@0 | 37 | // done |
| michael@0 | 38 | {value: 34, done: true} |
| michael@0 | 39 | ]; |
| michael@0 | 40 | |
| michael@0 | 41 | assertDeepEq(expected, collect_results(countdown(3))); |
| michael@0 | 42 | |
| michael@0 | 43 | if (typeof reportCompare == "function") |
| michael@0 | 44 | reportCompare(true, true); |
