tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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semantics-04.js (368B)

      1 // Giving an Array an own .iterator property affects for-of.
      2 
      3 load(libdir + "asserts.js");
      4 load(libdir + "iteration.js");
      5 
      6 var a = [];
      7 a[Symbol.iterator] = function* () {
      8    yield 'o';
      9    yield 'k';
     10 };
     11 var s = '';
     12 for (var v of a)
     13    s += v;
     14 assertEq(s, 'ok');
     15 
     16 a[Symbol.iterator] = undefined;
     17 assertThrowsInstanceOf(function () { for (var v of a) ; }, TypeError);