React Virtual DOM Cycle Explained

SpendWise — Smart Personal Expense Tracker Excited to share a project I recently built to improve my frontend development skills and gain more hands-on experience with modern React and Next.js. Tech Stack ▸ Next.js 14 (App Router) ▸ TypeScript ▸ Tailwind CSS ▸ localStorage ▸ Custom React Hooks Core Features ▸ Add & remove categorized expenses ▸ Monthly budget management with real-time progress tracking ▸ Category-wise spending insights ▸ Clean, responsive UI with smooth interactions Key Takeaways → Hands-on experience with App Router & file-based routing → Clear understanding of Server vs Client components → Stronger TypeScript fundamentals (interfaces & union types) → Writing optimized custom hooks using useEffect and useCallback Every project teaches something new, this one strengthened both my fundamentals and confidence in building production-ready apps. Live Demo: https://lnkd.in/eGC6iHnh GitHub: https://lnkd.in/e9_qFHa7 #NextJS #ReactJS #TypeScript #FrontendDevelopment #WebDev #BuildInPublic #JavaScript

🚀 Just Built a Todo App with React + Tailwind I recently completed a Todo application where I focused on strengthening my understanding of: • React state management (useState) • Lifting state up for proper component communication • Controlled inputs • Conditional rendering • LocalStorage integration for persistence • Clean UI design using Tailwind CSS Instead of just building a basic form, I structured the app properly by separating concerns: Form handling component Todo display component Centralized state management Persistent storage sync with useEffect This project helped me move beyond “it works” thinking and start focusing on architecture and clean component design. Source Code (GitHub): 👉 https://lnkd.in/gf3_hHg4 Next steps: Implement better state management patterns Always building. Always improving. #ReactJS #FrontendDevelopment #WebDevelopment #JavaScript #TailwindCSS #LearningInPublic #OpenSource

## DAY 23 — React To-Do App (Rebuild) Day 23/30: I rebuilt my Day 20 To-Do List in React. Same features. Completely different experience. Vanilla JS version: 200+ lines of DOM manipulation, querySelector everywhere, manual state tracking. React version: clean components, useState for state, props for data flow, and the UI just updates when data changes. No more document.getElementById. I finally understand why React exists. Not because someone explained it — because I built the same thing twice and felt the difference. The code is cleaner, more organized, and I could add new features in minutes instead of hours. 🔗 Live: https://lnkd.in/gWYqnKGu 🔗 Code: https://lnkd.in/g3S9JDnt #30DaysOfCode #React #JavaScript #WebDevelopment #BuildInPublic #WomenInTech

𝗬𝗼𝘂𝗿 𝗙𝗹𝗮𝘁𝗟𝗶𝘀𝘁 𝗶𝘀 𝗽𝗿𝗼𝗯𝗮𝗯𝗹𝘆 𝘀𝗹𝗼𝘄. And most developers don’t know why. FlatList is powerful. But if you don’t configure it properly, your app will lag — especially with large datasets. 𝗧𝗵𝗲 𝗺𝗼𝘀𝘁 𝗰𝗼𝗺𝗺𝗼𝗻 𝗺𝗶𝘀𝘁𝗮𝗸𝗲𝘀: - Not using keyExtractor properly - Missing getItemLayout - Rendering heavy components inside each item - Not using React.memo - Ignoring initialNumToRender & windowSize 𝗛𝗼𝘄 𝘁𝗼 𝗳𝗶𝘅 𝗶𝘁: - Use stable keys - Memoize list items - Use getItemLayout when item height is fixed - Avoid inline functions in renderItem - Tune windowSize based on use case 𝗣𝗿𝗼 𝗧𝗶𝗽: FlatList performance is not magic. It’s configuration. Optimize it once. Your app feels 10x smoother. React Native is fast. You just have to let it be. #reactnative #reactnativeperformance #mobileappdevelopment #javascript #frontenddevelopment #softwaredevelopment #codingtips #mobiledevelopers #appoptimization

💻 React Calculator App – Built with React + Vite Excited to share my new project — a fully functional Calculator built using React. 🔹 Built with React + Vite 🔹 Clean and responsive UI 🔹 Handles basic arithmetic operations 🔹 Component-based architecture This project helped me understand: • State management in React • Handling button click events • Updating UI dynamically • Project deployment using Vercel 🔗 Live Demo: ( https://lnkd.in/gv7S3Jdm) GitHub:(https://lnkd.in/gFMVd7gs) I’m consistently building and improving every day 🚀 Feedback is always welcome! #React #FrontendDeveloper #WebDevelopment #100DaysOfCode #JavaScript

Most React developers make these 5 mistakes that slow down their app without realising it. 1. Not memoizing components properly Re-rendering components that don't need to re-render is the #1 performance killer. Use React.memo and useMemo where it actually matters — not everywhere. 2. Putting everything in one component A 500-line component is not a component. It's a problem. Break it down. Your future self will thank you. 3. Ignoring lazy loading If you're not code-splitting with React.lazy() and Suspense, you're loading everything upfront. Your users feel that. 4. Skipping key props in lists Using index as key is not the same as using a unique ID. It causes subtle, hard-to-debug UI bugs. 5. Not cleaning up useEffect Memory leaks happen silently. Always return a cleanup function when subscribing to events or timers. Save this post. Your next React project will be cleaner for it. Which one are you guilty of, let me know in the comments. #ReactJS #FrontendDevelopment #WebDevelopment #ReactTips #NextJS #JavaScript #FrontendDev

Thursday – React Tip ⚛️ Not every state belongs in React state. One common mistake I see: Using useState for values that don’t affect rendering. Example: const [timerId, setTimerId] = useState(null) But if the value doesn’t impact UI, storing it in state causes unnecessary re-renders. Better option: Use useRef. const timerRef = useRef(null) Why this works: useRef stores values that persist between renders without triggering re-renders. Good use cases: • Storing timers • Accessing DOM elements • Keeping mutable values • Tracking previous values Think of it like this: useState → affects UI useRef → internal value storage Small decisions like this help keep React apps efficient. React performance often comes down to choosing the right hook for the job. #ReactJS #FrontendDevelopment #ReactTips #WebDevelopment #LearningInPublic

🚀 Just built a full-featured Todo App in React! ✅ Add, Edit & Update tasks ✅ Mark tasks as Complete / Pending ✅ Filter by All / Completed / Pending ✅ Persistent data with LocalStorage ✅ Clean UI with counters & interactive buttons This project helped me strengthen my React skills, state management, and UI handling. 🌟 Source Code: 👉https://lnkd.in/dSRsWdeM Muhammad Osama Saylani Mass I.T Training (S.M.I.T) #ReactJS #WebDevelopment #JavaScript #FrontendDevelopment #CodingJourney #ProjectShowcase #TodoApp

Why React Re-Renders More Than You Think Most React apps don’t slow down because of heavy logic. They slow down because of unnecessary re-renders. New object. New function. New reference. = New render. At small scale, you don’t notice. At product scale, it hurts. The real question is 👇 How do you control re-renders in large React applications? • Do you rely on React.memo()? • Heavy use of useCallback / useMemo? • State colocation strategy? • Or custom performance patterns? Drop your approach below 👇 Let’s compare senior-level strategies. #ReactJS #FrontendEngineering #WebPerformance #JavaScript #SoftwareArchitecture #ScalableApps #TechLeadership #FrontendArchitecture #PerformanceOptimization #CleanCode #UIEngineering #SoftwareDevelopment #ActiveBirdsSolutions #Activebirdssolutions #ReactDevelopers #EngineeringLeadership

Why React Re-Renders More Than You Think Most React apps don’t slow down because of heavy logic. They slow down because of unnecessary re-renders. New object. New function. New reference. = New render. At small scale, you don’t notice. At product scale, it hurts. The real question is 👇 How do you control re-renders in large React applications? • Do you rely on React.memo()? • Heavy use of useCallback / useMemo? • State colocation strategy? • Or custom performance patterns? Drop your approach below 👇 Let’s compare senior-level strategies. #ReactJS #FrontendEngineering #WebPerformance #JavaScript #SoftwareArchitecture #ScalableApps #TechLeadership #FrontendArchitecture #PerformanceOptimization #CleanCode #UIEngineering #SoftwareDevelopment #ActiveBirdsSolutions #Activebirdssolutions #ReactDevelopers #EngineeringLeadership