From ac25147171544e7fa8027d36309bbaf4ca7d8d41 Mon Sep 17 00:00:00 2001
From: atulll <39869656+underager@users.noreply.github.com>
Date: Fri, 8 Oct 2021 18:41:18 +0530
Subject: [PATCH] enh(Javascript): add rotation feature in singly link list.
 (#530)

---
 .../JavaScript/src/linked-lists/singly.js     | 26 +++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/algorithms/JavaScript/src/linked-lists/singly.js b/algorithms/JavaScript/src/linked-lists/singly.js
index f6641e25..da192b3b 100644
--- a/algorithms/JavaScript/src/linked-lists/singly.js
+++ b/algorithms/JavaScript/src/linked-lists/singly.js
@@ -152,6 +152,28 @@ class SinglyLinkedList {
     return returnNode;
   }
 
+  rotate() {
+    if (!this.head) {
+      return;
+    }
+
+    let currentNode = this.head;
+    let previousNode = null;
+    let tempNextRefNode;
+
+    while (currentNode) {
+      tempNextRefNode = currentNode.next;
+      currentNode.next = previousNode;
+
+      previousNode = currentNode;
+      currentNode = tempNextRefNode;
+    }
+
+    this.head = previousNode;
+
+    return this;
+  }
+
   printList() {
     // if head is null then list is empty
     if (this.head == null) {
@@ -185,3 +207,7 @@ array.printList();
 array.removeFromEnd();
 
 array.printList();
+
+array.rotate();
+
+array.printList();