Second Great Low

/***************************************************************************************
*                                                                                      *
*                  CODERBYTE BEGINNER CHALLENGE                                        *
*                                                                                      *
*  Second Great Low                                                                    *
*  Using the JavaScript language, have the function SecondGreatLow(arr) take the array *
*  of numbers stored in arr and return the second lowest and second greatest numbers,  *
*  respectively, separated by a space. For example: if arr contains                    *
*  [7, 7, 12, 98, 106] the output should be 12 98. The array will not be empty and     *
*  will contain at least 2 numbers. It can get tricky if there's just two numbers!     *                                              *
*                                                                                      *
*  SOLUTION                                                                            *
*  This challenge has one outlier and that is if there are only two elements in the    *
*  array. In that case you sort the pair and return each entry as the second highest   *
*  and second lowest.                                                                  *
*  Outside of that I am going to sort the array in ascending order and remove          *
*  duplicate values. Then retorn the second entry and the next to last entry.          *
*                                                                                      *
*  Steps for solution                                                                  *
*    1) Check for outlier of array with only two entries                               *
*    2) Sort array in ascending order                                                  *
*    3) Remove duplicate values                                                        *
*    4) Return second and next to last values for answer                               *
*                                                                                      *
***************************************************************************************/

function SecondGreatLow(arr) { 

  if (arr.length === 2) {
        arr.sort(function(a,b) {return a - b});
        return arr[1] + " " + arr[0];
   }
    
  var uniqueArray = arr.filter(function(item, pos) {
    return arr.indexOf(item) == pos;
  });
    
  if (uniqueArray.length > 2) {
    uniqueArray.sort(function(a, b){return a-b});
     return uniqueArray[1] + " " + uniqueArray[uniqueArray.length - 2]; 
  }
  else {
    return uniqueArray[1] + " " + uniqueArray[0];
  }
         
}