How to Write Better React Components: Composition and Reusability

🚀 Understanding React Class Component Lifecycle In React, Class Components have a well-defined lifecycle — a sequence of methods that run during the component’s creation, update, and removal from the DOM. Knowing these lifecycle methods helps developers control how components behave and interact with data at each stage. 🔹 1. Mounting Phase – When the component is created and inserted into the DOM. ➡️ constructor() – Initializes state and binds methods. ➡️ render() – Returns JSX to display UI. ➡️ componentDidMount() – Invoked after the component mounts; ideal for API calls or setting up subscriptions. 🔹 2. Updating Phase – When props or state changes cause a re-render. ➡️ shouldComponentUpdate() – Decides if the component should re-render. ➡️ render() – Re-renders the updated UI. ➡️ componentDidUpdate() – Called after re-render; perfect for DOM updates or data fetching based on previous props/state. 🔹 3. Unmounting Phase – When the component is removed from the DOM. ➡️ componentWillUnmount() – Used to clean up (like removing event listeners or canceling API calls). 💡 Example: I recently implemented lifecycle methods in a project to fetch product data using componentDidMount() from a fake API(https://lnkd.in/gkFvXQV6) and dynamically display it on the UI. It helped me understand how React efficiently handles rendering and updates. 10000 Coders Meghana M #ReactJS #WebDevelopment #Frontend #Learning #ReactLifecycle #JavaScript #CodingJourney

🎯 Frontend Project: To-Do Application with Deadline & Local Storage (📅 Week 12) This week, I built a To-Do Application using React.js, focused on productivity and time management — with features to add, edit, delete, and track tasks efficiently. 🧩 What I Focused On: Implementing add, edit, and delete functionality for tasks Allowing users to set deadlines and receive visual notifications for crossed deadlines Categorizing tasks as completed or pending for better organization Storing data in Local Storage to retain tasks even after browser refresh Using React state management and props for dynamic updates Designing a clean, responsive UI for smooth user experience 💻 Technologies Used: React.js – Component-based frontend framework JavaScript (ES6) – Logic and interactivity HTML/CSS – UI layout and styling Local Storage API – Data persistence React Hooks (useState, useEffect) – State and lifecycle management 🧠 This week helped me strengthen my React fundamentals, especially in handling state management, component interactions, and data persistence. It was a great step toward mastering frontend logic with real-time task updates. #Week12 #Reactjs #FrontendDevelopment #ToDoApp #JavaScript #LocalStorage #WebApp #Hooks #StateManagement #CRUD #Productivity #LearningByDoing #52WeeksOfLearning #Brototype #BrototypeCalicut #BCK307 #MERNJourney

🧩 Custom Hooks: The Hidden Superpower of React When React introduced hooks, it wasn’t just another API — it was a quiet revolution. ⚡ Before hooks, we wrote class components that grew like wild forests. Logic was tangled across lifecycles, duplicated, or hidden behind HOCs. Then came this little thing called useSomething(). Suddenly, we could extract logic like Lego blocks. 💡 The moment I truly understood React wasn’t when I learned useEffect. It was when I realized I could write my own. function useOnlineStatus() {  const [isOnline, setIsOnline] = useState(navigator.onLine);  useEffect(() => {   const updateStatus = () => setIsOnline(navigator.onLine);   window.addEventListener('online', updateStatus);   window.addEventListener('offline', updateStatus);   return () => {    window.removeEventListener('online', updateStatus);    window.removeEventListener('offline', updateStatus);   };  }, []);  return isOnline; } That’s not a utility — that’s architecture in disguise. Hooks make behavior composable, predictable, and testable. The biggest mistake developers make? Using built-in hooks forever but never writing their own. Once you start thinking in custom hooks, you stop building components — and start designing systems of logic. #ReactJS #Hooks #FrontendDevelopment #CleanCode #JavaScript #WebArchitecture #ReactDesignPatterns #SystemDesign

Simple Calculator in ReactJS (Task Completions) Build a clean, responsive Simple Calculator in React.js — I’ll walk through each task we complete, from UI to keyboard support, and ship a working component by the end. 🚀 I build a Simple Calculator with ReactJS and explain every task I complete so you can follow along and reproduce it. I start from a blank create-react-app (or Vite) project, create a reusable Calculator component, wire up state and handlers, and add keyboard support and basic styling. What I complete (tasks / timestamps) 00:00 — Intro & goals 00:30 — Project setup (create-react-app / Vite) 01:45 — File structure & component plan (Calculator, Display, Keypad) 03:00 — Build the calculator UI (HTML + CSS / Tailwind-ready classes) 05:20 — Implement number input and display updates 07:10 — Add basic operations: +, -, ×, ÷ 09:00 — Handle operator chaining and precedence (simple left-to-right evaluation) 10:30 — Implement decimal point and prevent invalid inputs 11:40 — Add C (clear) and ⌫ (backspace) functionality 13:00 — Add = evaluation and safe calculation (avoid eval) 14:15 — Keyboard support (numbers, ops, Enter, Backspace, Escape) 15:30 — Minor UX polish: button active states, responsive layout 16:10 — Quick demo of edge cases and bug fixes 17:00 — Wrap up, next steps, and where to get the code Component decomposition (Calculator, Display, ButtonGrid) React state management using useState and simple reducer pattern ideas Handling floating point precision (rounding/display fixes) Keyboard accessibility and focus management Lightweight CSS for responsive layout (or Tailwind utility classes if you prefer) Call to action If this helped you, smash that Like 👍, Subscribe for more React builds, and tell me in the comments what feature you want next (history, parentheses, scientific functions?). Code in the repo — link above. Happy coding! 💻✨ #ReactJS #Web #ReactJS #JavaScript #WebDevelopment #Frontend #CodingTutorial #BeginnerProject #100DaysOfCode #CodeNewbie #ReactTutorial #Programming #BuildInPublic #Developer #UI #OpenSource #LearnToCode #indolike

If you’re curious like me about how frontend web frameworks are built or how they work under the hood, this book is a great read “Build a Frontend Web Framework (From Scratch)”. I really enjoyed reading it! It’s fun, surprisingly comprehensive, and gives a clear mindset about what’s happening behind tools like React, Vue, or Svelte. It’s not about creating a production framework, it’s about learning by building, from the DOM to virtual DOM, state management, and reconciliation algorithms. Here’s a summary and key takeaways: 1. Frameworks aren’t magic Frameworks automate repetitive, low-level DOM work. When you build one from scratch, you realize they’re just organized layers of abstraction, not magic. 2. Start from the roots You begin by coding a small app with vanilla JavaScript, manually updating the DOM to understand what problems frameworks solve. 3. Virtual DOM & Reconciliation You then build a virtual DOM, a lightweight JS representation of the actual DOM. You learn how frameworks diff (compare) two virtual trees to apply minimal updates to the browser DOM, the same concept React uses. 4. State Management The book teaches a reducer-based state manager, similar to Redux’s idea: Centralized state Dispatch actions → reducers update state → re-render the view 5. Components You build functional and class-based components that: Hold their own state Re-render when state changes Can nest inside each other and communicate via props and events 6. Lifecycle & Scheduler Later chapters add lifecycle hooks (onMounted, onUnmounted) and an async scheduler to coordinate rendering, similar to Vue’s nextTick or React’s reconciliation cycle. 7. Advanced Concepts You also explore: Keyed lists (for efficient updates) Component communication Testing asynchronous components and extras like routing and slots in the GitHub wiki. Check it out here: [ https://lnkd.in/dquAstr6 ] #FrontendDevelopment #WebDevelopment #JavaScript #WebFramework #CodingBooks #SoftwareEngineering #ReactJs #FrontEndDeveloper #NextJs

🧩 Composition — React’s Most Underrated Superpower When developers first learn React, the focus is usually on components, props, and hooks. But what truly makes React powerful isn’t any single API — it’s composition. React was designed around the idea that complex UIs can be built by composing smaller, reusable pieces — much like assembling Lego blocks. This simple idea solves one of the hardest problems in software: ➡️ Keeping code flexible, while still maintainable. Let’s break it down 👇 1️⃣ Props as configuration You can pass data and behavior through props, turning generic components into context-specific ones. <Button label="Save" onClick={handleSave} /> The same Button component can be used for a hundred different actions. 2️⃣ Children as composition Composition isn’t just about props — it’s about nesting components to create expressive, readable UIs. <Card> <Profile /> <Stats /> </Card> Now your Card component doesn’t need to know what’s inside — it just defines how things look. 3️⃣ Reusability through boundaries The best components don’t just share code — they share structure and intent. When you compose instead of duplicate, your system evolves without breaking itself. That’s the beauty of React’s design philosophy: It doesn’t tell you how to build — it gives you the freedom to design your own boundaries. And once you master composition, you stop thinking in components… and start thinking in systems. #ReactJS #FrontendDevelopment #WebArchitecture #DesignPatterns #SystemDesign #JavaScript #CleanCode #ReactDesignPatterns #WebDevelopment

⚛️ Understanding React Hooks: useMemo, useReducer, useCallback & Custom Hooks React Hooks make functional components more powerful and efficient. Here are four advanced hooks every React developer should know.. 🧠 1. useMemo Purpose: Optimizes performance by memoizing (remembering) the result of a computation. React re-renders components often useMemo prevents re-calculating expensive values unless dependencies change. Use it for: heavy calculations or filtered lists. ⚙️ 2. useReducer Purpose: Manages complex state logic more efficiently than useState. It works like a mini version of Redux inside your component — using a reducer function and actions. Use it for: forms, complex state transitions, or when multiple states depend on each other. 🔁 3. useCallback Purpose: Prevents unnecessary re-creations of functions during re-renders. It returns a memoized version of a callback function so it’s not recreated every time unless dependencies change. Use it for: optimizing child components that rely on reference equality. 🪄 4. Custom (User-Defined) Hooks Purpose: Reuse stateful logic across components. If you find yourself using the same logic in multiple places, you can create your own hook (e.g., useFetch, useLocalStorage, etc.). Use it for: fetching data, handling forms, authentication logic, etc. 🚀 These hooks help write cleaner, faster, and more maintainable React code. Understanding when and how to use them will make you a more efficient developer. #React #ReactJS #ReactHooks #useMemo #useReducer #useCallback #CustomHooks #FrontendDevelopment #FrontendEngineer #WebDevelopment #WebDeveloper #JavaScript #JS #ES6 #Programming #Coding #DeveloperCommunity #TechLearning #MERN #stemup

🚀 React Concepts Series — Deck 6 is live! Today we’re exploring one of the most powerful (but often underrated) React hooks: useReducer. If you’ve ever felt your state logic getting messy with too many useState calls… this hook is the upgrade you need. 💡 What you’ll learn in this deck: ➡️ What useReducer really is (interview-ready definition) It’s perfect when your next state depends on the previous one — or when state transitions start getting complex. ➡️ Reducer + Dispatch explained clearly Reducer decides the “how”, dispatch triggers the “what”. Predictable. Clean. Testable. ➡️ A practical example The counter example shows exactly why useReducer is better once your logic grows: everything is centralized and easier to maintain. ➡️ useReducer + useContext = Mini Redux This is one of the cleanest patterns for global state in small to mid-size apps. No heavy libraries required. ➡️ Interview-focused recap When to use it, why reducers must be pure, how dispatch works, and how it resembles Redux. 🧠 Why this deck matters: Understanding when to use useReducer is one of the biggest signals of maturity in React — especially in interviews. It shows you understand predictability, state flow, and scalable architecture. #ReactJS #useReducer #AdvancedReact #ContextAPI #StateManagement #FrontendDevelopment #WebDevelopment #JavaScript #ReactInterview #LearningInPublic

🚀 Advanced React: Mastering Array Rendering & List Optimization As React developers, we often work with arrays and lists, but are we doing it efficiently? Here are some advanced techniques to level up your skills: ✅ 1. Always Use Unique Keys Never use array indices as keys for dynamic lists. Use unique IDs to help React optimize re-renders and avoid bugs when items are added/removed. ⚡ 2. Virtualization for Large Lists Rendering 10,000+ items? Use react-window or react-virtualized to render only visible items. This dramatically reduces DOM nodes and improves performance. 🎯 3. Map Function Best Practices The .map() method is your friend! Create dynamic UI components without repetitive code. Return JSX directly within map for cleaner code. 🔧 4. Pagination & Infinite Scroll For massive datasets, implement pagination or infinite scroll patterns. Load data in chunks as users scroll to maintain smooth performance. 💡 5. Memoization with React.memo Prevent unnecessary re-renders of list items by wrapping components with React.memo. Combine with useMemo for expensive computations. 📊 Example Pattern: const items = data.map((item) => (  <ListItem key={item.id} {...item} /> )); Remember: Performance optimization isn't premature optimization—it's smart development! #ReactJS #WebDevelopment #JavaScript #FrontendDevelopment #ReactOptimization #CodingTips #SoftwareEngineering #WebPerformance

React just made forms less painful – meet useActionState 😎 🧠 Truth bomb: For years, every React developer has written the same 3 things for forms: useState, useEffect, and... a whole lot of tears 😅 We handled loading states, success messages, and API responses manually — basically doing the same thing every single time 🙄 💡 Now enters React 19’s superhero: useActionState 🦸♂️ It takes care of your form submissions, state updates, and loading indicators — all in just a few lines of code. No more juggling multiple hooks like: const [data, setData] = useState(); const [loading, setLoading] = useState(); const [error, setError] = useState(); Now it’s simply: const [state, action, isPending] = useActionState(yourAction, initialState); and boom 💥 — React handles the rest. 🎭 Fun fact: Before this hook, React devs were basically doing “form yoga” — trying to balance async actions, error states, and spinners in one file. 🧘♂️ Now, it’s finally one smooth flow. 🔥 When to use it? 1. Form submissions (client or server actions) 2. Async API calls 3. Handling UI states without spaghetti code 🍝 💬 Your turn: Have you tried useActionState yet? What’s the most chaotic form handling experience you’ve had in React? 😂 Drop your funniest story below 👇 #JavaScript #WebDevelopment #CodingHumor #FrontendDevelopment #TechEducation #ProgrammingFun #LearnToCode #CodeNewbie #DeveloperCommunity #100DaysOfCode