Merge pull request #6 from ms10398/master

Added Implementation of Selection Sort

Author: AnupKumarPanwar

Sorts/selectionSort.js

@@ -0,0 +1,37 @@
+/*The selection sort algorithm sorts an array by repeatedly finding the minimum element
+ *(considering ascending order) from unsorted part and putting it at the beginning. The
+ *algorithm maintains two subarrays in a given array.
+ *1) The subarray which is already sorted.
+ *2) Remaining subarray which is unsorted.
+ *
+ *In every iteration of selection sort, the minimum element (considering ascending order)
+ *from the unsorted subarray is picked and moved to the sorted subarray.
+ */
+function selectionSort(items) {
+  var length = items.length;
+  for (var i = 0; i < length - 1; i++) {
+    //Number of passes
+    var min = i; //min holds the current minimum number position for each pass; i holds the Initial min number
+    for (var j = i + 1; j < length; j++) { //Note that j = i + 1 as we only need to go through unsorted array
+      if (items[j] < items[min]) { //Compare the numbers
+        min = j; //Change the current min number position if a smaller num is found
+      }
+    }
+    if (min != i) {
+      //After each pass, if the current min num != initial min num, exchange the position.
+      //Swap the numbers
+      var tmp = items[i];
+      items[i] = items[min];
+      items[min] = tmp;
+    }
+  }
+}
+
+//Implementation of Selection Sort
+
+var ar = [5, 6, 7, 8, 1, 2, 12, 14];
+//Array before Sort
+console.log(ar);
+selectionSort(ar);
+//Array after sort
+console.log(ar);