tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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Map-iterator-proxies-2.js (931B)

      1 // map.iterator() and iter.next() are non-generic but work on cross-compartment wrappers.
      2 
      3 load(libdir + "asserts.js");
      4 load(libdir + "eqArrayHelper.js");
      5 load(libdir + "iteration.js");
      6 
      7 var g = newGlobal();
      8 
      9 var iterator_fn = Map.prototype[Symbol.iterator];
     10 assertThrowsInstanceOf(function () { iterator_fn.call({}); }, TypeError);
     11 assertThrowsInstanceOf(function () { iterator_fn.call(new Set()); }, TypeError);
     12 var mapw = g.eval("new Map([['x', 1], ['y', 2]])");
     13 assertEqArray(iterator_fn.call(mapw).next().value, ["x", 1]);
     14 
     15 var next_fn = (new Map())[Symbol.iterator]().next;
     16 assertThrowsInstanceOf(function () { next_fn.call({}); }, TypeError);
     17 assertThrowsInstanceOf(function () { next_fn.call((new Set())[Symbol.iterator]()); }, TypeError);
     18 var iterw = mapw[Symbol.iterator]();
     19 assertEqArray(next_fn.call(iterw).value, ["x", 1]);
     20 assertEqArray(next_fn.call(iterw).value, ["y", 2]);
     21 assertEq(next_fn.call(iterw).done, true);