What Is Linklist in Data Structure?


Larry Thompson

Linklist is a fundamental data structure in computer science and programming. It is used to store and organize data in a linear manner, where each element or node points to the next element in the list. In this article, we will explore what linklist is, its advantages and disadvantages, and how it works.

Understanding Linklist

A linklist consists of nodes, where each node contains two components: the data and a reference to the next node in the list. The first node is called the head, while the last node points to null or contains a null reference. This indicates the end of the list.

The linklist can be visualized as a chain of nodes, where each node holds some data and points to the next node. This allows for efficient insertion and deletion operations compared to other data structures like arrays.

Advantages of Linklist

  • Dynamic Size: Unlike arrays, linklists can grow or shrink dynamically as elements are added or removed. This makes it flexible for handling varying amounts of data.
  • Efficient Insertion and Deletion: Linklists excel in inserting or deleting elements at any position within the list. It involves changing only a few references instead of shifting elements like in arrays.
  • No Wasted Memory: Linklists utilize memory efficiently as each node only requires space for its own data and reference to the next node.

Disadvantages of Linklist

  • Random Access: Unlike arrays, linklists do not support random access. To access an element, we need to traverse from the head until reaching the desired position.

    This makes accessing elements slower compared to arrays.

  • Extra Memory: Linklists require extra memory to store the references or pointers to the next node. This overhead can be significant when dealing with large amounts of data.

Types of Linklist

Singly Linked List

In a singly linked list, each node contains a reference to the next node only. Traversing this type of linklist is straightforward as we move from one node to the next until reaching the end.

Doubly Linked List

A doubly linked list extends the concept of a singly linked list by adding an additional reference to the previous node in each node. This allows for traversal in both directions, providing more flexibility at the cost of extra memory.

Circular Linked List

In a circular linked list, the last node points back to the first node, forming a loop. This enables continuous traversal from any point in the list.

Implementing Linklist

To implement a linklist, we define a Node structure that holds both data and a reference to the next node. We also maintain a pointer to the head of the list for easy access.

class Node {
    constructor(data) {
        this.data = data;
        this.next = null;

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

    // Add methods for insertion, deletion, and traversal

In conclusion, linklist is an essential data structure that provides dynamic size and efficient insertion/deletion operations. Although it lacks random access and requires extra memory for references, its flexibility and simplicity make it a valuable tool in programming.

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