Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    function rand(from, to) {
      from = from || 0;
      to = to || 255;
      return Math.floor(Math.random() * (to - from + 1) + from);
    }
    
    var arr = [];
    for (var i = 0; i < 10; i++) {
      arr.push([rand(), rand(), rand()]);
    }
    
    function arrtostring(a) {
      return a.join();
    }
  };
</script>

Test runner

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var ret = arr.map(arrtostring);

var ret = arr.map(function(a) {
  return a.join();
});

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