rem: } 
add: } 
context: function concat(size) {  var c='qwertyuiop';  var x='';  var y='';  var loop;  for (loop = 0; loop < size; loop++)  {    x += c;  }  y = x + 'y';  x = x + 'x';  var start = new Date();  for (loop = 0; loop < 1000; loop++)   {     var z = x + y + loop.toString();  }   var stop = new Date();  return stop - start;} 
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