React Fiber Explained

DAY 12 React Renders Are Just Function Calls REACT RENDERS ARE JUST FUNCTION CALLS A React component is just a function. Rendering is just calling that function. Strip away all the magic — a React functional component is literally a JavaScript function that returns JSX. When React "renders" it, it calls the function. The output (JSX) is transformed into React.createElement() calls, producing a plain object description of the UI. Nothing is painted yet at this stage. React is just building a description. The DOM work comes later. Understanding that rendering = function call demystifies hooks, closures, and why the order of hooks must never change. Did this mental model shift how you think about React? #ReactInternals #JSX #JavaScript #WebDevelopment

One small mistake I used to make in React.js 👇 I was re-rendering components unnecessarily, which was affecting performance. What helped me fix it: • Using React.memo for pure components • useCallback to prevent function re-creation • useMemo for expensive calculations 📊 Result: Better performance and smoother UI experience Sometimes small optimizations make a big difference ⚡ #ReactJS #FrontendDeveloper #WebPerformance #JavaScript

I used to write React without knowing what was happening beneath the surface. Then I went down the rabbit hole of React internals. Fiber changed how I think about rendering, performance, and why React is designed the way it is. React Fiber is one of those things every React dev should understand but almost nobody does. Here's the full breakdown — reconciliation, scheduling, fiber nodes, double buffering — in 16 slides. If you're preparing for interviews or want to go beyond surface-level React… This is a must-know concept. Save this for later 🔖 #ReactJS #WebDevelopment #Frontend #JavaScript #ReactFiber #SoftwareEngineering #ProgrammingTips #LearnToCode #FrontendDevelopment #TechCarousel

One styling approach I’ve been using in React.js applications ⚛️ Combining CSS Modules with Tailwind CSS works really well for scalable frontend development. Here’s why: • Scoped styling → avoids class conflicts • Faster UI development using utility classes • Clean and modular component-based structure • Easy to build responsive layouts This approach helps in building maintainable and high-performance applications. What’s your preferred styling approach in React? 🤔 #ReactJS #FrontendDeveloper #TailwindCSS #WebDevelopment #JavaScript

🚀 Code Splitting with React.lazy and Suspense (JavaScript) Code splitting is a technique used to reduce the initial load time of a web application by breaking down the code into smaller chunks. React.lazy allows you to load components only when they are needed, improving the initial loading performance. React.Suspense is used to display a fallback UI while the lazy-loaded component is being loaded. This combination improves the user experience by providing a faster initial load and a visual indicator of loading content. Using dynamic imports with React.lazy is the recommended approach. #JavaScript #WebDev #Frontend #JS #professional #career #development

Nobody told me this when I started React. For a long time, I just accepted the virtual DOM as magic. Interviewers kept asking about it. I kept giving some vague answer about "React being fast" and "not touching the real DOM directly." They'd nod. I'd move on. Nobody ever pushed back. So I never actually looked into it. Then one day, someone asked me to explain it to a junior developer on my team. And I realised I had nothing real to say. So I finally sat down and figured it out. And honestly — it's not magic at all. It's embarrassingly simple once you see it. The virtual DOM is just a JavaScript object. That's it. It's a plain object that describes what your UI looks like. Every component, every element, every attribute — represented as a nested object in memory. When your state changes, React doesn't immediately go and update the browser. Instead, it builds a new JavaScript object — a new description of what the UI should look like now. Then it compares the old object with the new one. Finds the differences. And only updates those specific parts in the actual browser DOM. That's the whole thing. Compare two objects. Patch what changed. Done. Why does this matter? Because touching the real DOM is slow. The browser has to recalculate layouts, repaint pixels, do a lot of work. React minimises how often that happens by doing the heavy thinking in JavaScript first — which is fast — and then making the smallest possible change to the browser. I went from "it's a React performance thing" to actually understanding the mechanism. Two very different things. If you're going into a React interview and someone asks about the virtual DOM — don't just say it's fast. Explain the compare-and-patch. That's the answer they're actually looking for. #React #JavaScript #Frontend #ReactJS #WebDevelopment #Programming #ReactInterview #100DaysOfCode

Today I explored some core concepts of React that changed the way I see frontend development : • How React works behind the scenes • Rendering process in React • Virtual DOM vs Real DOM • Diff Algorithm (how react updates efficiently) • Client Side Rendering (CSR) • Server Side Rendering (SSR) One thing I found really interesting is how React uses the virtual DOM and diff algorithm to update only the necessary parts of the UI, making apps faster and more efficient. I'm excited to dive deeper and build more projects using these concepts! #React #Javascript #MernStackDevelopment

Lately, I’ve been focusing a lot on one thing: reusability. Building shared components and using them across different panels and applications has completely changed how I work. Everything feels faster, cleaner, and far more consistent. Instead of rebuilding the same UI again and again, I now rely on a single reusable component system that I can plug in wherever it’s needed. Here’s what improved as a result: • Better code reusability • More consistent UI across apps • Easier maintenance • Faster development cycles • Cleaner structure across multiple frontend projects Project stack: Vue 3, TypeScript, JavaScript, Vite, Vue Router, Pinia, PrimeVue, Tailwind CSS, Yarn Workspaces This setup is helping me get real-world experience in building scalable, well-structured frontend systems. #FrontendDeveloper #VueJS #JavaScript #TypeScript #Monorepo #YarnWorkspaces #ReusableComponents #WebDevelopment #FrontendArchitecture #PrimeVue #TailwindCSS

Most frontend engineers know 𝙬𝙝𝙖𝙩 𝙩𝙤 𝙤𝙥𝙩𝙞𝙢𝙞𝙯𝙚. Very few understand why the 𝗕𝗿𝗼𝘄𝘀𝗲𝗿 𝗥𝗲𝗻𝗱𝗲𝗿's things in a specific order — and how breaking that order silently kills 𝙥𝙚𝙧𝙛𝙤𝙧𝙢𝙖𝙣𝙘𝙚. The 𝘾𝙧𝙞𝙩𝙞𝙘𝙖𝙡 𝙍𝙚𝙣𝙙𝙚𝙧𝙞𝙣𝙜 𝙋𝙖𝙩𝙝 is that missing piece. It connects 𝑯𝑻𝑴𝑳 parsing, 𝑪𝑺𝑺𝑶𝑴 construction, 𝑱𝒂𝒗𝒂𝑺𝒄𝒓𝒊𝒑𝒕 blocking, and 𝑷𝒂𝒊𝒏𝒕 into one story that actually makes sense. #react #javascript #browser #crp #frontend #architecture #frontendengineer #nextjs #web #performance #html #css

One small React habit that improved my code a lot: Stop putting everything in one component. Earlier, I used to write large components with too much logic. It worked… but became messy very quickly. Now I try to: • Break UI into smaller components • Keep logic separate • Reuse components wherever possible This makes the code cleaner and easier to scale. If you're learning React, start thinking in components, not pages. #reactjs #frontend #webdevelopment #javascript