Array direct assignment vs push

JavaScript performance comparison

Revision 44 of this test case created by

Preparation code 


      
      <script>

        Benchmark.prototype.setup = function() {

          
  var array = new Array(100);

        
  };


      
</script>

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
Direct assignment 
for(var i = 0; i < 100; i++)
{
  array[i] = "test";
}
 pending…
Push 
for(var i = 0; i < 100; i++)
{
  array.push("test");
}
 pending…
Direct assignment (calculated) 
for(var i = 0; i < 100; i++)
{
  array[array.length - 1] = "test";
}
 pending… 
for(var i = 99; i >= 0; i--)
{
  array[i] = "test";
}
 pending… 
for(var i = 99; i >= 0; i--)
{
  array.push("test");
}
 pending… 
for(var i = 99; i >= 0; i--)
{
  array[array.length - 1] = "test";
}
 pending…

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