Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var l = 1e3, values = [];
    while (l--) {
      values.push(Math.random() * 1e4);
    }
    
    function process (i) {
      i*=2;
    }
  };
</script>

Test runner

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var length = values.length;

for (var i=length; i--;){
    process(values[i]);
}
 

var length = values.length;

var j=length;
do {
    process(values[--j]);
} while (j);

 

var length = values.length;

var k=length;
while (k--){
    process(values[k]);
}

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