Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var str = '';
    var array;
    
    // generate a random 20 character string 
    (function () {
      var chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXTZabcdefghiklmnopqrstuvwxyz",
          rnum;
    
      for (var i = 0; i < 20; i++) {
        rnum = Math.floor(Math.random() * 61);
        str += chars.substring(rnum, rnum + 1);
      }
      array = str.split('');
    }());
  };
</script>

Test runner

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var s = '';
for(var i = 0, len = array.length; i < len; i++) {
    s = s + array[i];
}

var a = [], s = '';
for(var i = 0, len = array.length; i < len; i++) {
   a.push(array[i]);
}
s = a.join('');

var s = '';
for(var i = 0, len = array.length; i < len; i++) {
    s += array[i];
}

var s = '';
for(var i = 0; i < array.length; i++) {
    s += array[i];
}

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