read-write array vs variable

JavaScript performance comparison

Test case created by Timo

Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var pre_filled_array = [];
    for(var i=0;i<10;i++)
    {
      pre_filled_array.push(i);
    }
    var temp = 0;
  };
</script>

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Testing in unknown unknown
Test Ops/sec
Array member directly
 
for(var i=0;i<10;i++)
{
  pre_filled_array[i] = pre_filled_array[i]+1;
  pre_filled_array[i] = pre_filled_array[i]*2;
  pre_filled_array[i] = pre_filled_array[i]/3;
  pre_filled_array[i] = pre_filled_array[i]-1;
  pre_filled_array[i] = pre_filled_array[i]+5;
  pre_filled_array[i] = pre_filled_array[i]*4;
  pre_filled_array[i] = pre_filled_array[i]/3;
  pre_filled_array[i] = pre_filled_array[i]-2;

}
 pending…
Through temp var
 
for(var i=0;i<10;i++)
{
  temp = pre_filled_array[i];
  temp = temp+1;
  temp = temp*2;
  temp = temp/3;
  temp = temp-1;
  temp = temp+5;
  temp = temp*4;
  temp = temp/3;
  temp = temp-2;
  pre_filled_array[i]=temp;
}
 pending…

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