tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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slice.js (884B)

      1 let invoked = false;
      2 Object.defineProperty(Array.prototype, '0', {set: function () {
      3    invoked = true;
      4 }});
      5 
      6 let result = [1, 2, 3].slice(1);
      7 assertEq(invoked, false);
      8 
      9 let proxy = new Proxy({}, {
     10    get: function (target, name, proxy) {
     11        switch (name) {
     12          case "length":
     13            return 2;
     14          case "0":
     15            return 15;
     16          case "1":
     17            // Should not invoke [[Get]] for this hole.
     18          default:
     19            assertEq(false, true);
     20        }
     21    },
     22    has: function (target, name) {
     23        switch (name) {
     24          case "0":
     25            return true;
     26          case "1":
     27            return false;
     28          default:
     29            assertEq(false, true);
     30        }
     31    }
     32 })
     33 result = Array.prototype.slice.call(proxy, 0);
     34 assertEq(result.length, 2);
     35 assertEq(0 in result, true);
     36 assertEq(1 in result, false);
     37 assertEq(result[0], 15);