Merge pull request #65 from KuLi/combSort

Implemented comb sort algorithm

Sorts/combSort.js

@@ -0,0 +1,53 @@
+/* 
+Wikipedia says: Comb sort improves on bubble sort. 
+
+The basic idea is to eliminate turtles, or small values 
+near the end of the list, since in a bubble sort these slow the sorting 
+down tremendously. Rabbits, large values around the beginning of the list, 
+do not pose a problem in bubble sort.
+
+In bubble sort, when any two elements are compared, they always have a 
+gap (distance from each other) of 1. The basic idea of comb sort is 
+that the gap can be much more than 1. The inner loop of bubble sort, 
+which does the actual swap, is modified such that gap between swapped 
+elements goes down (for each iteration of outer loop) in steps of 
+a "shrink factor" k: [ n/k, n/k2, n/k3, ..., 1 ].
+
+*/
+function combSort(list) {
+
+
+    if (list.length === 0) {
+        return list;
+    }
+    let shrink = 1.3;
+    let gap = list.length;
+    let isSwapped = true;
+    let i = 0
+
+    while (gap > 1 || isSwapped) {
+        // Update the gap value for a next comb
+        gap = parseInt(parseFloat(gap) / shrink, 10);
+
+        isSwapped = false
+        i = 0
+
+        while (gap + i < list.length) {
+            if (list[i] > list[i + gap]) {
+
+                let value = list[i];
+                list[i] = list[i + gap];
+                list[i + gap] = value;
+                isSwapped = true;
+            }
+            i += 1
+        }
+    }
+    return list
+}
+let arrOrignal = [5, 6, 7, 8, 1, 2, 12, 14];
+//Array before Sort
+console.log(arrOrignal);
+arrSorted = combSort(arrOrignal);
+//Array after sort
+console.log(arrSorted);