The Tor Browser / file diff

     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/js/src/jit-test/tests/for-of/proxy-1.js	Wed Dec 31 06:09:35 2014 +0100
     1.3 @@ -0,0 +1,28 @@
     1.4 +// Basic for-of test with Proxy.
     1.5 +
     1.6 +function iterableProxy(arr) {
     1.7 +    return Proxy.create({
     1.8 +        getPropertyDescriptor: function (name) {
     1.9 +            for (var obj = arr; obj; obj = Object.getPrototypeOf(obj)) {
    1.10 +                var desc = Object.getOwnPropertyDescriptor(obj, name);
    1.11 +                if (desc)
    1.12 +                    return desc;
    1.13 +            }
    1.14 +            return undefined;
    1.15 +        }
    1.16 +    });
    1.17 +}
    1.18 +
    1.19 +var s = '';
    1.20 +var arr = ['a', 'b', 'c', 'd'];
    1.21 +var p = iterableProxy(arr);
    1.22 +
    1.23 +// Test the same proxy twice. Each time through the loop, the proxy handler's
    1.24 +// getPropertyDescriptor method will be called 10 times (once for 'iterator',
    1.25 +// five times for 'length', and once for each of the four elements).
    1.26 +for (var i = 0; i < 2; i++) {
    1.27 +    var j = 0;
    1.28 +    for (var x of p)
    1.29 +        assertEq(x, arr[j++]);
    1.30 +    assertEq(j, arr.length);
    1.31 +}