Implementation of Doubly Linked List
Example: This example demonstrate the basic implementation of a link list.
Javascript
// Doubly Linked list Node class Node { // Constructor to create a new node // next and prev is by default initialized as null constructor(val) { // To store the value this .data = val; // To link the next Node this .next = null ; // TO link the previous Node this .prev = null ; } } // Doubly Linked List class DoublyLinkedList { // Constructor to create a new linked list constructor() { // To contain the first item of the list this .head = null ; // To contain the last item of the list this .tail = null ; } // To check if the list is empty isEmpty() { if ( this .head == null ) return true ; return false ; } // Method to add item at the last of doubly linked list addItem(val) { // Create a temporary variable let temp = new Node(val); // If the list is empty link assign // new node to both head and tail if ( this .head == null ) { this .head = temp; this .tail = temp; } // else add item to the tail and shift tail else { this .tail.next = temp; this .tail = this .tail.next; } } // To traverse and display the list display() { // Check if the List is empty if (! this .isEmpty()) { // traverse the list using new current pointer let curr = this .head; while (curr !== null ) { // Display element console.log(curr.data); // Shift the current pointer curr = curr.next; } } } } // Create new Doubly Linked List const dll = new DoublyLinkedList(); // Add elements in the list dll.addItem(25); dll.addItem(27); dll.addItem(17); dll.addItem(29); // Display the list dll.display(); |
Output
25 27 17 29
Implementation of Doubly Linked List in JavaScript
This article will demonstrate the Implementation of Doubly Linked List In JavaScript.
A doubly linked list (DLL) is a special type of linked list in which each node contains a pointer to the previous node as well as the next node of the linked list.