Added Implementation of Insertion Sort

Sorts/insertionSort.js

@@ -0,0 +1,24 @@
+/*In insertion sort, we divide the initial unsorted array into two parts;
+* sorted part and unsorted part. Initially the sorted part just has one
+* element (Array of only 1 element is a sorted array). We then pick up
+* element one by one from unsorted part; insert into the sorted part at
+* the correct position and expand sorted part one element at a time.
+*/
+function insertionSort(unsortedList) {
+  var len = unsortedList.length;
+  for (var i = 1; i < len; i++) {
+    var tmp = unsortedList[i]; //Copy of the current element.
+    /*Check through the sorted part and compare with the number in tmp. If large, shift the number*/
+    for (var j = i - 1; j >= 0 && (unsortedList[j] > tmp); j--) {
+      //Shift the number
+      unsortedList[j + 1] = unsortedList[j];
+    }
+    //Insert the copied number at the correct position
+    //in sorted part.
+    unsortedList[j + 1] = tmp;
+  }
+}
+
+var arr = [5, 3, 1, 2, 4, 8, 3, 8];
+insertionSort(arr);
+console.log(arr);