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comparison: js/src/jit-test/tests/for-of/next-shenanigans.js
js/src/jit-test/tests/for-of/next-shenanigans.js
- changeset 0
- 6474c204b198
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| -1:000000000000 | 0:4171a2de58c9 |
|---|---|
| 1 // Test for-of with iter.next and monkeypatching. | |
| 2 | |
| 3 function* g(n) { for (var i=0; i<n; i++) yield i; } | |
| 4 var GeneratorObjectPrototype = Object.getPrototypeOf(g).prototype; | |
| 5 var GeneratorObjectPrototype_next = GeneratorObjectPrototype.next; | |
| 6 | |
| 7 // Monkeypatch next on an iterator. | |
| 8 var inner = g(20); | |
| 9 var n = 0; | |
| 10 for (let x of inner) { | |
| 11 if (n == 0) { | |
| 12 assertEq(x, n++); | |
| 13 } else if (n == 1) { | |
| 14 assertEq(x, n++); | |
| 15 inner.next = function() { return { value: 42, done: false }; }; | |
| 16 } else if (n == 2) { | |
| 17 assertEq(x, 42); | |
| 18 inner.next = function() { return { value: 100, done: true }; }; | |
| 19 } else | |
| 20 throw 'not reached'; | |
| 21 } | |
| 22 | |
| 23 // Monkeypatch next on the prototype. | |
| 24 var inner = g(20); | |
| 25 var n = 0; | |
| 26 for (let x of inner) { | |
| 27 if (n == 0) { | |
| 28 assertEq(x, n++); | |
| 29 } else if (n == 1) { | |
| 30 assertEq(x, n++); | |
| 31 GeneratorObjectPrototype.next = | |
| 32 function() { return { value: 42, done: false }; }; | |
| 33 } else if (n == 2) { | |
| 34 n++; | |
| 35 assertEq(x, 42); | |
| 36 GeneratorObjectPrototype.next = GeneratorObjectPrototype_next; | |
| 37 } else if (n <= 20) { | |
| 38 assertEq(x, n++ - 1); | |
| 39 } else | |
| 40 throw 'not reached'; | |
| 41 } |
