Add wiggle sort

Sorts/wiggleSort.js

@@ -0,0 +1,26 @@
+/*
+* Wiggle sort sorts the array into a wave like array.
+* An array ‘arr[0..n-1]’ is sorted in wave form if arr[0] >= arr[1] <= arr[2] >= arr[3] <= arr[4] >= …..
+*
+*/
+
+Array.prototype.wiggleSort = function() {
+  for (let i = 0; i < this.length; ++i) {
+    const shouldNotBeLessThan = i % 2;
+    const isLessThan = this[i] < this[i + 1];
+    if (shouldNotBeLessThan && isLessThan) {
+      [this[i], this[i + 1]] = [this[i + 1], this[i]];
+    }
+  }
+  return this;
+};
+
+//Implementation of wiggle sort
+
+var arr = [3, 5, 2, 1, 6, 4];
+//Array before Wiggle Sort
+console.log(arr); //[3, 5, 2, 1, 6, 4]
+
+arr.wiggleSort()
+//Array after wiggle sort
+console.log(arr); // [ 3, 5, 2, 6, 1, 4 ]