Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var i;
    
    var packed_array1 = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
    
    var packed_array2 = new Array(11);
    for (i = 0; i < 11; i++ ) {
      packed_array2[i] = i;
    }
    
    var holey_array1 = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
    delete holey_array1[0];
    
    var holey_array2 = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
    holey_array2[13] = 0;
    
    var holey_array3 = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, /* hole */, 10];
    
    var holey_array4 = new Array(11);
    
    // only fill the first 10 elements
    for (i = 0; i < 10; i++) {
      holey_array4[i] = i;
    }
    
    function sum(array) {
      var sum = 0;
      for (var i = 0; i < array.length; i++) {
        if (typeof array[i] !== "undefined") {
          sum += array[i];
        }
      }
    }
    
  };
</script>

Test runner

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sum(packed_array1);

sum(holey_array1);

sum(holey_array2);

sum(holey_array3);

sum(holey_array4);

sum(packed_array2);

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Revisions

You can edit these tests or add even more tests to this page by appending /edit to the URL. Here’s a list of current revisions for this page:

• Revision 1: published on 25th October 2012
• Revision 2: published on 5th November 2012
• Revision 3: published on 6th November 2012
• Revision 4: published by Yu-Cheng Chuang on 7th November 2012
• Revision 5: published by Yu-Cheng Chuang on 7th November 2012
• Revision 6: published on 11th November 2012
• Revision 7: published by Volkan Ozcelik on 28th April 2013
• Revision 8: published by Hyzhak on 29th April 2013

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