Data Structure in JavaScript

What is a Data Structure?

In computer science, a data structure is a data organization, management, and storage format that is usually chosen for efficient access to data.

What is Linked List?

🧠 A linked list is a linear collection of data elements whose order is not given by their physical placement in memory.

What are the types of Linked List?

  1. Singly LinkedList
  2. Doubly Linked List
  3. Circular Linked List

What is Node in a Linked List?

A linked List is a collection of connected nodes where the node is something that has the data part as well as the link to the next node.

class Node{

How to implement Linked List?

In a Linked list, mostly what we know is the head node; from the head node, we can get the other remaining nodes. Head node is the first node in a linked list. We can also maintain a tail node in order to make operations faster.

class LinkedList{constructor(){this.head=null;

Add a single node

✓ This is how you add a single node to LinkedList

Add a new node at the head

While adding a new node, the new Node should point to the current head Node and then the head should point to the new node

class LinkedList{constructor(){this.head=null;
addElementatHead(key) {let node = new Node(key);if (this.head == null) {this.head = node;return;} else { = this.head;this.head = node;}}}

Add a new node at the End Of a Linked List

//inside classaddElemenAtEnd(key) {let node = new Node(key);if (this.head == null) {this.head = node;return;} else {let temp = this.head;while (temp.right !== undefined) {temp = temp.right;}temp.right = node;}

Traverse through Linked List

//inside class linkedlist as a methodtraverse() {let temp = this.head;// console.log(;while (temp?.key != undefined) {console.log(temp.key);temp =;}}

Remove at Head

removeathead(){let temp = this.head;this.head =;temp = null;}

Happy Learning, Happy Coding



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Adarsh gupta

Adarsh gupta


Software Engineer | JavaScript developer | Technical Writer . Work with me?