performance-tuning-$7.lzx

<canvas height="150" width="100%">
    <include href="utils/performance"/>
    <script>
      var iterations = Measurement.defaultIterations;
      var testObj = {a: 1, b: 2, c: 3, d: 4, e: 5, f: 6};

      function e () {
        return 0;
      }
      function empty () {
        for (var i = 0; i < iterations; i++) 
          e.call(testObj);
      }

      function withThis () {
        with (this) {return a + b + c + d + e + f};
      } 
      function measureWithThis () {
        for (var i = 0; i < iterations; i++) 
          withThis.call(testObj);
      }

      function thisDot () {
        return this.a + this.b + this.c + this.d + this.e + this.f;
      }
      function measureThisDot () {
        for (var i = 0; i < iterations; i++) 
          thisDot.call(testObj);
      }

      (new Measurement({'with (this)': measureWithThis,
                          'this.': measureThisDot,
                          'empty': empty})).run();
    </script>
  </canvas>
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