Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var a = {
      x: [1, 2, 3, 4, 5, 6],
      kittyThis: function() {
        var sum = 0;
        for (var i = 0, l = this.x.length; i < l; i++) sum += this.x[i];
        return sum;
      },
      kittyVar: function() {
        var sum = 0, x = this.x;
        for (var i = 0, l = x.length; i < l; i++) sum += x[i];
        return sum;
      }
    };
  };
</script>

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a.kittyThis();

a.kittyVar();

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