The Tor Browser / file revision

 function strings()

 {

   var a = [], b = -1;

   var s = "abcdefghij", s2 = "a";

   var f = "f";

   var c = 0, d = 0, e = 0, g = 0;

   for (var i = 0; i < 10; i++) {

     a[i] = (s.substring(i, i+1) + s[i] + String.fromCharCode(s2.charCodeAt(0) + i)).concat(i) + i;

     if (s[i] == f)

       c++;

     if (s[i] != 'b')

       d++;

     if ("B" > s2)

       g++; // f already used

     if (s2 < "b")

       e++;

     b = s.length;

   }

   return a.toString() + b + c + d + e + g;

 }

 assertEq(strings(), "aaa00,bbb11,ccc22,ddd33,eee44,fff55,ggg66,hhh77,iii88,jjj991019100");