js/src/jit-test/tests/for-of/proxy-1.js@6474c204b198 (annotated)
js/src/jit-test/tests/for-of/proxy-1.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 | // Basic for-of test with Proxy. |
| michael@0 | 2 | |
| michael@0 | 3 | function iterableProxy(arr) { |
| michael@0 | 4 | return Proxy.create({ |
| michael@0 | 5 | getPropertyDescriptor: function (name) { |
| michael@0 | 6 | for (var obj = arr; obj; obj = Object.getPrototypeOf(obj)) { |
| michael@0 | 7 | var desc = Object.getOwnPropertyDescriptor(obj, name); |
| michael@0 | 8 | if (desc) |
| michael@0 | 9 | return desc; |
| michael@0 | 10 | } |
| michael@0 | 11 | return undefined; |
| michael@0 | 12 | } |
| michael@0 | 13 | }); |
| michael@0 | 14 | } |
| michael@0 | 15 | |
| michael@0 | 16 | var s = ''; |
| michael@0 | 17 | var arr = ['a', 'b', 'c', 'd']; |
| michael@0 | 18 | var p = iterableProxy(arr); |
| michael@0 | 19 | |
| michael@0 | 20 | // Test the same proxy twice. Each time through the loop, the proxy handler's |
| michael@0 | 21 | // getPropertyDescriptor method will be called 10 times (once for 'iterator', |
| michael@0 | 22 | // five times for 'length', and once for each of the four elements). |
| michael@0 | 23 | for (var i = 0; i < 2; i++) { |
| michael@0 | 24 | var j = 0; |
| michael@0 | 25 | for (var x of p) |
| michael@0 | 26 | assertEq(x, arr[j++]); |
| michael@0 | 27 | assertEq(j, arr.length); |
| michael@0 | 28 | } |
