A set is an abstract data type that can store certain values, without any particular order and no repeated values. It is a computer implementation of the mathematical concept of a finite set. Unlike most other collection types, rather than retrieving a specific element from a set, one typically tests a value for membership in a set.

In the doubly linked list, the next pointer of the last node points to the first node and the previous pointer of the first node points to the last node making the circular in both directions.Insertions and deletions in a circular linked list are the same as other linked lists. You just need to keep track of the last link while performing operations on either end of the linked list.You can look up and try implementing Circular linked list using Circular Linked List Algorithm as a guide.

In the singly linked list, the next pointer of the last node points to the first node.

Circular Linked List is a variation of the Linked list in which the first element points to the last element and the last element points to the first element. Both Singly Linked List and Doubly Linked List can be made into a circular linked list.

Here is the complete implementation of the DoublyLinkedList Class −Exampleclass DoublyLinkedList {    constructor() {       this.head = null;       this.tail = null;       this.length = 0;    }    insert(data, position = this.length) {       let node = new this.Node(data);       // List is currently empty       if (this.head === null) {          this.head = node;          this.tail = node;          this.length++;          return this.head;       }       // Insertion at ... Read More

Removing an element is very easy in a linked list. We just need to get rid of the node we want to remove, ie, lose its reference. There are 3 cases we need to consider −Removing an element from head: In this case, we can simply assign head = head.next and remove the previous link from the next element. This way we'll lose the reference of the first element. And out head will start pointing to the second element.Removing an element from the tail: In this case, we can simply assign the node.next of second last node to be null ... Read More

We need to create a function insert(data, position) that inserts data at given position in the linked list. We'll perform the following steps −Create a new NodeCheck if the list is empty. If it then adds the node to head and tail and return.If not, then we'll iterate to the position we want to insert it to using currElem. We iterate a linked list by making currElem equal to currElem.next. Now we change the links in the following way −Make new node point to next node in a listMake next node's previous point to the new nodeMake our node point to ... Read More

Lets start by defining a simple class with a constructor that initializes the head and tail to null. We'll also define another structure on the prototype of the DoublyLinkedList class that'll represent each node in the linked list. Exampleclass LinkedList {    constructor() {       this.head = null;       this.tail = null;       this.length = 0;    } } LinkedList.prototype.Node = class {    constructor(data) {       this.data = data;       this.next = null;       this.prev = null;    } };Let's also create a display function that'll help us ... Read More

In this article, we are going to discuss a Doubly Linked List Class data structure in JavaScript. This is a linear data structure. Doubly linked lists are almost the same as a singly linked list in all operations, we just need to keep track of one extra link per node. In singly linked lists, we just had next links, in doubly linked lists, we have 2 links, next and prev. Doubly linked lists are represented as − Note that in the class itself, we also need to keep track of the tail(last element). Example In this example, we understand ... Read More

Here is the complete implementation of the LinkedList class −  Exampleclass LinkedList {    constructor() {       this.head = null;       this.length = 0;    }    insert(data, position = this.length) {       let node = new this.Node(data);       if (this.head === null) {          this.head = node;          this.length++;          return this.head;       }       let iter = 1;       let currNode = this.head;       while (currNode.next != null && iter < position) { ... Read More