take.net lookandsay

function lookandsay(x) {
   var ans = "";

   var current = x[0], count = 1;

   for (var i = 1; i < x.length; i++)
     if (x[i] == current)
       count++;
     else
       ans += count.toString() + current, count = 1, current = x[i];

   ans += count.toString() + current;

   return ans;
}