The Tor Browser / file comparison
comparison: js/src/jit-test/tests/for-of/proxy-1.js
js/src/jit-test/tests/for-of/proxy-1.js
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| 1 // Basic for-of test with Proxy. | |
| 2 | |
| 3 function iterableProxy(arr) { | |
| 4 return Proxy.create({ | |
| 5 getPropertyDescriptor: function (name) { | |
| 6 for (var obj = arr; obj; obj = Object.getPrototypeOf(obj)) { | |
| 7 var desc = Object.getOwnPropertyDescriptor(obj, name); | |
| 8 if (desc) | |
| 9 return desc; | |
| 10 } | |
| 11 return undefined; | |
| 12 } | |
| 13 }); | |
| 14 } | |
| 15 | |
| 16 var s = ''; | |
| 17 var arr = ['a', 'b', 'c', 'd']; | |
| 18 var p = iterableProxy(arr); | |
| 19 | |
| 20 // Test the same proxy twice. Each time through the loop, the proxy handler's | |
| 21 // getPropertyDescriptor method will be called 10 times (once for 'iterator', | |
| 22 // five times for 'length', and once for each of the four elements). | |
| 23 for (var i = 0; i < 2; i++) { | |
| 24 var j = 0; | |
| 25 for (var x of p) | |
| 26 assertEq(x, arr[j++]); | |
| 27 assertEq(j, arr.length); | |
| 28 } |
