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comparison: js/src/jit-test/tests/for-of/semantics-09.js
js/src/jit-test/tests/for-of/semantics-09.js
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| -1:000000000000 | 0:147754e9b79f |
|---|---|
| 1 // The LHS of a for-of loop is not evaluated until after the .next() method returns. | |
| 2 | |
| 3 var s; | |
| 4 function f() { | |
| 5 s += 'f'; | |
| 6 return {}; | |
| 7 } | |
| 8 | |
| 9 // Test 1: .next() throws StopIteration right away. f is never called. | |
| 10 s = ''; | |
| 11 for (f().x of []) | |
| 12 s += '.'; | |
| 13 assertEq(s, ''); | |
| 14 | |
| 15 // Test 2: check proper interleaving of f calls, iterator.next() calls, and the loop body. | |
| 16 function g() { | |
| 17 s += 'g'; | |
| 18 yield 0; | |
| 19 s += 'g'; | |
| 20 yield 1; | |
| 21 s += 'g'; | |
| 22 } | |
| 23 for (f().x of g()) | |
| 24 s += '.'; | |
| 25 assertEq(s, 'gf.gf.g'); |
