1. What is Virtual DOM in React? Virtual DOM is a lightweight copy of the real DOM used by React to improve performance. How it works: React creates a virtual DOM in memory Compares it with previous version (diffing) Updates only changed parts in real DOM Advantage: Faster updates Efficient rendering Improved performance 2. Explain Props in React with example. […]
🔷 1. React Counter App (Functional Component) ✅ Question: Create a counter app using functional components in React. 💻 Solution: import React, { useState } from “react”;function Counter() { const [count, setCount] = useState(0); return ( <div style={{ textAlign: “center” }}> <h2>Counter App</h2> <h3>{count}</h3> <button onClick={() => setCount(count + 1)}>Increment</button> <button onClick={() => setCount(count – 1)}>Decrement</button> </div> );}export default Counter; […]
📌 INTRODUCTION Node.js allows developers to create web servers very easily using its built-in http module. This module helps us handle client requests and send responses from the server. A simple HTTP server is one of the first and most important programs in Node.js because it introduces: Server creation Request handling Response sending Port listening In this program, we will […]
📌 INTRODUCTION File upload is one of the most useful features in web applications. It allows users to upload: Images PDF files Documents Resume files Project reports In Node.js, file upload is commonly implemented using: Express.js for server creation Multer middleware for handling file uploads In this program, we will build a simple Node.js File Upload Application that allows users […]
📌 INTRODUCTION File handling is one of the most important features of Node.js. Using Node.js, we can create, read, update, append, rename, and delete files easily. For file operations, Node.js provides the built-in fs module (fs stands for file system). In this program, we will learn how to perform common file operations such as: Creating a file Writing data into […]
If you are an MCA student preparing for Full Stack Development Lab, this post provides the complete list of lab programs along with solution links. It covers JavaScript, React, Node.js, MongoDB, Angular. 🟢 PART 1: JavaScript (ES6 Programs) Write a program using arrow function to find square root of elements of an array.👉 🔗 Solution: /arrow-function-square-root-array-js Write a program to […]
This blog describes how to append in a text file in Node.js. To append to a text file in Node.js, you can use the fs.appendFile() function from the built-in fs (File System) module. This function appends data to a file, creating the file if it does not exist. Here’s how you can use it. The fs.appendFile() function takes three arguments. […]
This blog describes How to Perform Various File Operations in Node.js. The following code shows a basic Node.js application that performs various file operations like reading, writing, copying, and deleting files. source.txt Output Make sure to create a source.txt file in the same directory as this script to test the read, write, copy, and delete operations. This script uses the […]
In this blog on Getting Started With NodeJS, I will explain how to start working with NodeJs using simple examples. Node.js is a popular runtime for server-side JavaScript applications. It’s built on the V8 JavaScript runtime and allows you to run JavaScript code on the server side, enabling the development of scalable and efficient web applications. Here’s a step-by-step guide […]
The following list provides some of the Important Concepts in NodeJS that every programmer should know. Modules in NodeJS NodeJS File System Events Node Package Manager (NPM) Callbacks Asynchronous I/O (Non-Blocking I/O) Promises Prototypes Brief Introduction of Important Concepts in NodeJS The following section provides a brief introduction of the above-mentioned concepts. Modules In fact, NodeJS offers lots of built-in […]