What Is Node With Example in Data Structure?


Heather Bennett

Node is a fundamental concept in data structures and plays a crucial role in various algorithms and applications. In this article, we will explore what a node is, its characteristics, and provide examples to help you understand its importance.

What is a Node?

A node can be defined as an individual element or unit of data in a data structure. It contains two main components: the actual data it holds, also known as the payload, and a reference or link to the next node in the sequence.

In simple terms, think of a node as a building block that forms the basic structure of various data structures such as linked lists, trees, graphs, and more. Each node stores some information and points to another node or nodes based on the type of data structure being used.

Characteristics of a Node

A node typically possesses the following characteristics:

  • Data: The actual information or content that is stored within the node.
  • Link/Reference: A reference to another node present in the data structure. It can be used to navigate from one node to another.

The specific implementation of nodes may vary depending on the type of data structure they are used in. However, these core characteristics remain consistent across most implementations.

Examples of Nodes

To better understand nodes, let’s consider a few examples:

Linked List Node

In a linked list, each node contains both data and a reference to the next node. Here’s an example:

    <code>class Node {
      constructor(data) {
        this.data = data;
        this.next = null;
    // Create nodes
    const node1 = new Node(10);
    const node2 = new Node(20);
    // Link nodes
    node1.next = node2;

In the above example, we create two nodes: node1 and node2. node1 stores the data value of 10 and has a reference to node2. This forms a linked list where the first node points to the second one.

Binary Tree Node

In a binary tree, each node can have at most two child nodes.left = null;
this.right = null;

// Create nodes
const root = new Node(50);
root.left = new Node(25);
root.right = new Node(75);

In this example, we create three nodes: root, left, and right. The root node has a data value of 50 and two child nodes: left node(25) and right node(75). This forms a binary tree structure.

In Conclusion

A node is a building block of various data structures, allowing us to store and organize data efficiently. By understanding the concept of a node, you can gain a deeper understanding of how different data structures work and how they can be applied in real-world scenarios.

Whether you need to implement linked lists, trees, or graphs, mastering the concept of nodes is crucial. So keep exploring and experimenting with nodes to enhance your understanding of data structures!

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