Data Structure in JavaScript

Adarsh gupta
3 min readJul 29, 2022

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Linked List 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.

A node(element in Linked List) has its data and reference to the next item

Let’s Break it Down🤩

What are the types of Linked List?

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

Picture speaks louder than words:👇🏻

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{
constructor(data){
this.data=data;
this.next=null}
}

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;
this.tail=null;
}
}

We have our Node as well as LinkedList Class.

Now let’s begin the actual fun by adding data to our linked list.

Let’s add a new Node to our Empty LinkedList.

Add a single node

✓ This is how you add a single node to LinkedList

✓ Let’s make a function to add a node at the head

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;
this.tail=null;
}
addElementatHead(key) {let node = new Node(key);if (this.head == null) {this.head = node;return;} else {node.next = 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(temp.next);while (temp?.key != undefined) {console.log(temp.key);temp = temp.next;}}

Remove at Head

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

Hope this detailed thread was useful. Follow me on Medium as well as on my Twitter handle Adarsh Gupta for more content around JavaScript, Web Development, DSA, and more.

I will be posting on data structures and algorithms so don't miss this opportunity. Start learning DSA and tag me on Twitter if you learned something from me.

Happy Learning, Happy Coding

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Adarsh gupta

Software Engineer | JavaScript developer | Technical Writer . Work with me? adarshguptaworks@gmail.com Connect with me? twitter.com/adarsh____gupta/