Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var alphabet = "a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z";
    var alphatmp = [];
    for (i = 0; i < 20; i++)
    alphatmp.push(alphabet);
    var str_to_split = alphatmp.join(',');
    var myarray = str_to_split.split(',');
  };
</script>

Test runner

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var tmp = [];
for (i = 0, il=myarray.length; i < il; i++) {
  tmp[i] = myarray[i];
}

var output = tmp.join('');

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

var output = '';
for (i = 0, il=myarray.length; i < il; i++) {
  output += myarray[i];
}

var tmp = [];
for (i = 0, il=myarray.length; i < il; i++) {
  tmp.push(myarray[i]);
}

var output = tmp.join('');

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