tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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object-assign-plain-cache.js (1717B)

      1 // The cache lookup must happen after ensuring there are no dense elements.
      2 function testNewDenseElement() {
      3    var from = {x: 1, y: 2, z: 3};
      4 
      5    for (var i = 0; i < 10; i++) {
      6        if (i === 6) {
      7            from[0] = 1;
      8        }
      9        var to = Object.assign({}, from);
     10        if (i >= 6) {
     11            assertEq(JSON.stringify(to), '{"0":1,"x":1,"y":2,"z":3}');
     12        } else {
     13            assertEq(JSON.stringify(to), '{"x":1,"y":2,"z":3}');
     14        }
     15    }
     16 }
     17 testNewDenseElement();
     18 
     19 // The cache lookup must happen after ensuring there are non-writable
     20 // properties on the proto chain.
     21 function testProtoNonWritable() {
     22    var proto = {x: 1};
     23    var from = {x: 1, y: 2, z: 3};
     24 
     25    for (var i = 0; i < 10; i++) {
     26        if (i === 6) {
     27            Object.freeze(proto);
     28        }
     29 
     30        var to = Object.create(proto);
     31        var ex = null;
     32        try {
     33            Object.assign(to, from);
     34        } catch (e) {
     35            ex = e;
     36        }
     37 
     38        assertEq(ex instanceof TypeError, i > 5);
     39 
     40        if (i <= 5) {
     41            assertEq(JSON.stringify(to), '{"x":1,"y":2,"z":3}');
     42        } else {
     43            assertEq(JSON.stringify(to), '{}');
     44        }
     45    }
     46 }
     47 testProtoNonWritable();
     48 
     49 function testDictionary1() {
     50    var from = {a: 1, b: 2, c: 3};
     51    delete from.a;
     52    for (var i = 0; i < 10; i++) {
     53        var to = Object.assign({}, from);
     54        assertEq(JSON.stringify(to), '{"b":2,"c":3}');
     55    }
     56 }
     57 testDictionary1();
     58 
     59 function testDictionary2() {
     60    var from = {a: 1, b: 2, c: 3};
     61    delete from.a;
     62    from.a = 4;
     63    for (var i = 0; i < 10; i++) {
     64        var to = Object.assign({}, from);
     65        assertEq(JSON.stringify(to), '{"b":2,"c":3,"a":4}');
     66    }
     67 }
     68 testDictionary2();