[Solution] FreeCodeCamp: No Repeats Please

function permAlone(str) {
  return permDupes(str.length,dupes(str));
}

function dupes(str)
{
  var count = 0;
  for( var i = 0; i < str.length; i++)
    {
      for( var j = i+1; j < str.length; j++ )
        {
          if(str[i] === str[j])
            {
              count++;
              str = str.substr(0,j)+str.substr(j+1,str.length);
              j--;
            }
        }
    }
  return count;
}

function permDupes(n, dupes)
{
  // Same letter case
  if(dupes + 1 === n)
    return 0;

  // No more Duplicates
  if(dupes <= 0)
    return 0;
  return factoral(n) - 2 * factoral(n-1) - 2 * permDupes(n-1,dupes-1);
}

function factoral(num){
  if(num <= 1)
    return 1;
  return num * factoral(num-1);
}

permAlone('aaaaaaaaaa');