tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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array-iterator-surfaces-2.js (950B)

      1 // Superficial tests for iterators created by Array.prototype.iterator
      2 
      3 load(libdir + "iteration.js");
      4 
      5 var proto = Object.getPrototypeOf([][Symbol.iterator]());
      6 var iterProto = Object.getPrototypeOf(proto);
      7 proto = Object.getPrototypeOf([].keys());
      8 assertEq(Object.getPrototypeOf(proto), iterProto);
      9 proto = Object.getPrototypeOf([].entries());
     10 assertEq(Object.getPrototypeOf(proto), iterProto);
     11 
     12 function check(it) {
     13    assertEq(typeof it, 'object');
     14    assertEq(Object.getPrototypeOf(it), proto);
     15    assertEq(Object.getOwnPropertyNames(it).length, 0);
     16    assertEq(it[Symbol.iterator](), it);
     17 
     18    // for-in enumerates the iterator's properties.
     19    it.x = 0;
     20    var s = '';
     21    for (var p in it)
     22        s += p + '.';
     23    assertEq(s, 'x.');
     24 }
     25 
     26 check([][Symbol.iterator]());
     27 check(Array.prototype[Symbol.iterator].call({}));
     28 check([].keys());
     29 check(Array.prototype.keys.call({}));
     30 check([].entries());
     31 check(Array.prototype.entries.call({}));