Create Second Great Low

Author: ratracegrad

Second Great Low

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+/***************************************************************************************
+*                                                                                      *
+*                  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];
+  }
+         
+}