performance-tuning-$4.lzx

<canvas height="150" width="100%">
    <include href="utils/performance"/>
    <script>
      var iterations = Measurement.defaultIterations;
      var textIndexes={};
      for (var i = 0; i < iterations; i++) {
        textIndexes[i] = i.toString();
      }

      function empty () {
        var testArray = [];
        for (var j in textIndexes ) {
          ;
        }
      }

      function measurePush () {
        var testArray = [];
        for (var j in textIndexes ) {
          testArray.push(j);
        }
      }

      function measureSetAtLength () {
        var testArray = [];
        for (var j in textIndexes) {
          testArray[testArray.length] = j;
        }
      }

      function measureSetAtIndex () {
        var testArray = [];
        for (var j in textIndexes) {
          testArray[j] = j;
        }
      }

      function measureSetAtIndexPreallocated () {
        var testArray = new Array(iterations);
        for (var j in textIndexes) {
          testArray[j] = j;
        }
      }

      function measureObjectSetAtIndex () {
        var testObject = {};
        for (var j in textIndexes) {
          testObject[j] = j;
        }
      }

      (new Measurement({'Array.push': measurePush,
                        'Array[Array.length] =': measureSetAtLength,
                        'Array[index] =':  measureSetAtIndex,
                        'Array[index] = (preallocated)':
                        measureSetAtIndexPreallocated,
                        'Object[key] =': measureObjectSetAtIndex,
                        'empty': empty})).run();
    </script>
  </canvas>
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