Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var object = {
      a: 42,
      b: 100,
      c: 23,
      d: 5234,
      e: 11,
      f: 89,
      g: 100
    };
  };
</script>

Test runner

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var _hasOwn = Object.prototype.hasOwnProperty,
    count = 0,
    key;

for (key in object) {
  if (_hasOwn.call(object, key)) {
    count += 1;
  }
}

return count;

return Object.keys(object).length;

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