Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var str = new Array(1000).join("aoskdakodoa"),
        i = str.length,
        r = "";
  };
</script>

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i = str.length;

while (i--) {
  r += str[i];
}

var t = [].slice.call(str),
    l = i / 2 >>> 0,
    c = 0,
    tmp;

for (c = 0; c < l; ++c) {
  tmp = t[c];
  t[c] = t[l - 1 - c];
  t[l - 1 - c] = tmp;
}

r = t.join("");

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