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27
28// Regression test checking that the sequence of element access in built-in
29// array functions is specification conform (i.e. [[HasProperty]] might return
30// bogus result after [[Get]] has been called).
31
32function CheckSequence(builtin, callback) {
33  var array = [1,2,3];
34  var callback_count = 0;
35  var callback_wrapper = function() {
36    callback_count++;
37    return callback()
38  }
39
40  // Define getter that will delete itself upon first invocation.
41  Object.defineProperty(array, '1', {
42    get: function () { delete array[1]; },
43    configurable: true
44  });
45
46  assertTrue(array.hasOwnProperty('1'));
47  builtin.apply(array, [callback_wrapper, 'argument']);
48  assertFalse(array.hasOwnProperty('1'));
49  assertEquals(3, callback_count);
50}
51
52CheckSequence(Array.prototype.every,       function() { return true; });
53CheckSequence(Array.prototype.filter,      function() { return true; });
54CheckSequence(Array.prototype.forEach,     function() { return 0; });
55CheckSequence(Array.prototype.map,         function() { return 0; });
56CheckSequence(Array.prototype.reduce,      function() { return 0; });
57CheckSequence(Array.prototype.reduceRight, function() { return 0; });
58CheckSequence(Array.prototype.some,        function() { return false; });
59