Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var targetArr = [];
    for (var i = 0; i < 100; i++) {
      targetArr.push(i);
    }
  };
</script>

Test runner

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var newarr = [];
for (var i in targetArr) {
  newarr[i] = targetArr[i];
}

var newarr = [];
for (var i = 0; i < targetArr.length; i++) {
  newarr[i] = targetArr[i];
}

var newarr = [],
    i = 0;
while (i < targetArr.length) {
  newarr[i] = targetArr[i];
  i++;
}

var newarr = [],
    i = 0;
do {
  newarr[i] = targetArr[i];
  i++;
}
while (i < targetArr.length);

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