React Basics: Virtual DOM Explained

⚛️ What Are React Hooks And Why Do They Matter? React Hooks are functions that let you use state and other React features inside functional components. Before Hooks, developers had to use class components to manage state and lifecycle methods. Hooks changed that. 🔹 What Hooks Allow You To Do: ✅ Manage state with useState ✅ Handle side effects with useEffect ✅ Share global state using useContext ✅ Manage complex state logic with useReducer ✅ Create reusable logic with Custom Hooks 🔹 Why Hooks Are Powerful: Cleaner and more readable components Less boilerplate compared to class components Better logic reusability Improved separation of concerns Hooks made functional components not just simpler but more powerful. Understanding Hooks is essential for modern React development. If you're building React applications in 2026, Hooks aren’t optional they’re fundamental. #ReactJS #ReactHooks #FrontendDevelopment #JavaScript #WebDevelopment #CleanCode

How I Reduced Unnecessary React Re-renders by ~30% in an Enterprise Application Recently, while working on a large-scale React application, we noticed certain UI modules were re-rendering more often than required — impacting responsiveness. After analyzing the component tree and state flow, I made a few targeted improvements: • Used React.memo for stable presentational components • Optimized useEffect dependency arrays • Avoided recreating functions inside renders • Applied useMemo and useCallback where it actually mattered • Restructured state to reduce prop drilling The result: Improved UI responsiveness and significantly reduced unnecessary re-renders across modules. Big reminder: Performance optimization in React is often less about adding tools and more about understanding how rendering actually works. Still learning something new about React every day. #reactjs #frontenddevelopment #javascript #webperformance #webdevelopment

🚀 Built a Todo List App using JavaScript & React! I recently created a Todo List project in two ways — first using pure JavaScript and then rebuilding it using React to understand the difference in handling data and UI. ✨ Features: • Add & Delete Tasks • Mark tasks as completed • Tasks saved in Local Storage (data stays after refresh) • Simple and clean UI 💡 What I learned: • DOM Manipulation using JavaScript • useState for state management in React • Handling user input and events • Using Local Storage with JSON.stringify() & JSON.parse() • Difference between Vanilla JS approach vs React approach This project really helped me understand how React makes UI updates easier and more structured compared to JavaScript. Small steps, but moving forward every day in my learning journey 💻✨ #ReactJS #JavaScript #FrontendDevelopment #WebDevelopment #LearningJourney

🚀 Built a Todo List App using JavaScript & React! I recently created a Todo List project in two ways — first using pure JavaScript and then rebuilding it using React to understand the difference in handling data and UI. ✨ Features: • Add & Delete Tasks • Tasks saved in Local Storage (data stays after refresh) • Simple and clean UI 💡 What I learned: • DOM Manipulation using JavaScript • useState for state management in React • Handling user input and events • Using Local Storage with JSON.stringify() & JSON.parse() • Difference between Vanilla JS approach vs React approach This project really helped me understand how React makes UI updates easier and more structured compared to JavaScript. Small steps, but moving forward every day in my learning journey 💻✨ #ReactJS #JavaScript #FrontendDevelopment #WebDevelopment #LearningJourney

💻 Revisiting React Fundamentals – Understanding State Today I revisited one of the core concepts of React: State management using the useState hook. To reinforce the concept, I built a small Counter component that performs different operations such as: ✔️ Increment ✔️ Decrement ✔️ Reset ✔️ Multiply by 2 ✔️ Square of a number This simple exercise helped me understand how state changes trigger UI updates in React and how event handlers like onClick interact with state. Sometimes revisiting basic concepts helps strengthen the foundation before building more complex applications. I’ve attached a short screen recording and code snippets showing how the counter works. Always learning, always improving. 🚀 #ReactJS #FrontendDevelopment #WebDevelopment #JavaScript #LearningInPublic #ReactDeveloper

Day 4: Functional vs Class Components In React, there are two main types of components: 1️⃣ Functional Components 2️⃣ Class Components Let’s understand the difference. 📌 Functional Components A Functional Component is simply a JavaScript function that returns JSX. Example: function Welcome() { return <h1>Hello React</h1>; } With the introduction of React Hooks, functional components can now handle state, lifecycle methods, and side effects. That’s why modern React applications mostly use Functional Components. 📌 Class Components A Class Component is a JavaScript class that extends React.Component. Example: import React, { Component } from "react"; class Welcome extends Component { render() { return <h1>Hello React</h1>; } } Before React Hooks, class components were used to manage state and lifecycle methods. 📌 Key Differences • Functional components use functions • Class components use ES6 classes • Functional components use Hooks (useState, useEffect) • Class components use lifecycle methods 📌 Which one should you use today? 👉 Functional Components They are: ✅ Simpler ✅ Easier to read ✅ Less boilerplate code ✅ Officially recommended in modern React #ReactJS #FrontendDevelopment #JavaScript #WebDevelopment #CodingJourney #LearnInPublic

𝗔 𝗦𝘂𝗯𝘁𝗹𝗲 𝗥𝗲𝗮𝗰𝘁 𝗕𝘂𝗴 𝗖𝗮𝘂𝘀𝗲𝗱 𝗯𝘆 𝗦𝘁𝗮𝗹𝗲 𝗦𝘁𝗮𝘁𝗲 Sometimes a bug in React isn’t caused by React itself. It comes from how JavaScript closures work. When you schedule a state update inside an asynchronous callback (like a timeout), that callback captures the value of state from the moment it was created. If the state changes before the callback runs, the update may still use the old value. This can lead to confusing behavior where your UI doesn’t update the way you expect. A safer approach is to use the functional update pattern. Instead of relying on the current state value, React gives you the latest state inside the updater function. This ensures your update always works with the most recent value. 👇 Example comparison below Day 13/100 — sharing practical frontend engineering lessons. Have you ever faced a bug caused by stale state in React? #ReactJS #FrontendEngineering #JavaScript #WebDevelopment #SoftwareEngineering

#Day59 of #100DaysOfCode Today I explored some important React and JavaScript concepts that help in building interactive web applications. 🔹 Handling Click Events – Learned how React responds to user clicks using event handlers like onClick. 🔹 Handling Non-Click Events – Explored events like keyboard input, form changes, and mouse movements. 🔹 Event Object – Understood how React provides event information (like target element, value, etc.) through the event object. 🔹 State in React – Learned how state helps store dynamic data and update the UI automatically. 🔹 Hooks – Got introduced to React Hooks which allow functional components to use features like state and lifecycle behavior. 🔹 useState() Hook – Practiced managing component state using useState. 🔹 Activity: Create Like Button – Built a simple Like Button to practice state updates and user interaction. 🔹 Closures in JavaScript – Understood how functions can access variables from their outer scope even after execution. 🔹 Re-render in React – Learned how React re-renders components when state or props change. 🔹 Callback in setState Function – Explored how callback functions help update state based on the previous state. 🔹 More About State – Deepened understanding of how state works internally in React. #React #JavaScript #MERN #WebDevelopment #100DaysOfCode #Day59complete✅👍🏻

Misunderstanding how JavaScript handles functions can hurt your UI performance. In JavaScript, functions are compared by reference. And in React, every render creates new function instances. So even if a function looks exactly the same, it’s actually a different reference in memory. That means when you pass a function as a prop, React sees it as a new value on every render. And if that component is wrapped with React.memo, it will still re-render. Not because React.memo doesn’t work, but because the prop actually changed. This can be solved by keeping the same function reference between renders, which is exactly what useCallback helps you do. This doesn’t mean you should use useCallback everywhere. It only matters when you need a stable function reference, like when passing props to memoized components. I’ve been using these techniques for a while, but it took me some time to really understand why they are often used together. This is a good example of how understanding the fundamentals of JavaScript can directly impact performance and behavior in React applications. (Simplified example in the image) #React #JavaScript #Frontend #WebDevelopment #SoftwareEngineering

We often think of components as a React thing props, hooks, JSX. But the browser already has a native way to build them: Web Components. No framework. Just JavaScript + the DOM. I wrote a quick breakdown showing how React concepts map directly to browser APIs and how to build a reusable component without any library. Curious to hear your thoughts 👇 #WebDevelopment #JavaScript #React #Frontend