React useMemo vs useCallback: Performance Optimization

⚛️ Improving React Performance with Lazy Loading As React applications grow, the bundle size can increase significantly. Loading all components at once can slow down the initial page load and impact the user experience. React Lazy Loading helps solve this problem by loading components only when they are needed, instead of including everything in the main JavaScript bundle. With tools like "React.lazy()" and "Suspense", React can split the code and dynamically load components when a user navigates to them. Benefits of React Lazy Loading: • Smaller initial bundle size • Faster page load • Better performance on slower networks • Improved overall user experience Optimizing how and when components load is a key step in building scalable and high-performance React applications. Reference from 👉 Sheryians Coding School #React #WebDevelopment #Frontend #JavaScript #Performance #SoftwareEngineering

🚀 7 Days of Better React – Day 4 Old Approach → Better Approach Faced a common issue while working with a search input. Every keystroke was triggering an API call. ❌ Old approach: useEffect(() => { fetchResults(query); }, [query]); This hits the API on every key press. ✅ Better approach (Debouncing): useEffect(() => { const timeout = setTimeout(() => { fetchResults(query); }, 500); return () => clearTimeout(timeout); }, [query]); Now the API call only happens after the user stops typing. Better performance. Fewer unnecessary requests. Better user experience. Optimization isn’t always complex. Sometimes it’s just controlling timing. #reactjs #frontenddeveloper #javascript #performance #webdevelopment

🚀 Built a Dynamic Product Listing Section using React & API Integration Today I implemented a fully dynamic product section by fetching real-time data from an external API using useEffect and fetch(). 🔹 What I Implemented: • API data fetching with async/await • State management using useState • Dynamic rendering using .map() • Reusable ProductCard component • Props-based data flow • Clean UI with Tailwind CSS • Unique key handling in list rendering This project strengthened my understanding of: React lifecycle, side effects, component reusability, and real-time data handling. #ReactJS #FrontendDevelopment #WebDevelopment #JavaScript #APIIntegration #TailwindCSS #LearningInPublic #MERN

🚀 React Hooks Small Projects I recently worked on a few small projects to better understand some important React Hooks. In this video, I demonstrated how these hooks work with simple examples so that beginners can easily understand their usage. 🔹 useState – Used to manage state inside a functional component. It helps update and display dynamic data in the UI. 🔹 useEffect – Used to handle side effects in React applications such as API calls, timers, and updating the DOM when state changes. 🔹 useContext – Helps share data globally across components without passing props manually through every level. 🔹 useReducer – A powerful hook for managing complex state logic, especially when multiple state updates depend on different actions. 🔹 useMemo – Optimizes performance by memoizing expensive calculations so they only run when dependencies change. 🔹 useCallback – Returns a memoized function to prevent unnecessary re-renders when passing functions to child components. These mini projects helped me strengthen my understanding of React Hooks and component optimization techniques. 📌 If you watch the video, you can easily understand how each hook works in a practical way. #ReactJS #ReactHooks #WebDevelopment #MERNStack #JavaScript #FrontendDevelopment #CodingPractice

React Series – Day 1 🚀 So… what exactly is React? React is a JavaScript library for building user interfaces. But practically? It helps you build complex UIs using small, reusable components. Instead of manipulating the DOM manually, React updates only what actually changes. That’s why it’s fast. Key ideas behind React: * Component-based architecture * Virtual DOM * Reusable UI pieces * One-way data flow Think of React like LEGO blocks. Small components → combined → complete application. Up Next: JSX — the syntax that makes React powerful. #ReactJS #FrontendDeveloper #WebDevelopment #ReactSeries

You built a React component. Now how does it actually respond to the real world? Events. Re-renders. useEffect. These 3 connect everything together. 👆 Events — onClick, onChange, onSubmit (always camelCase, always a function reference) 🔁 Re-rendering — only state via setter triggers screen updates (regular variables won't!) ⚡ The Flow — click → setState → re-render → diff → DOM update 🎯 useEffect — run side effects like data fetching, timers, subscriptions 📋 Dependency Array — [] runs once, [count] runs when count changes, no array runs every time 🚀 Real pattern — loading state + useEffect fetch + dependency array The biggest beginner mistake? Using let count = 0 instead of useState(0) and wondering why the screen never updates. Save this. You'll come back to it. ♻️ Repost to help someone learning React. #React #useEffect #JavaScript #WebDevelopment #Frontend #LearnToCode

Bubbling Concept in React: A Practical Breakdown 🚀 Why Your React Button Click Triggers the Parent (And How to Fix It) One small function can save you from unexpected UI behavior: e.stopPropagation() But what does it actually do? In JavaScript and React, events “bubble up” the DOM tree. That means when you click on a child element, the click event also triggers on its parent elements. Example: <div onClick={() => console.log("Parent clicked")}> <button onClick={() => console.log("Button clicked")}> Click Me </button> </div> If you click the button, the console will log: Button clicked Parent clicked Why? Because the click event bubbles from the button to the parent. 🛑 Preventing Event Bubbling If you want the button click to NOT trigger the parent’s click handler, use: <button onClick={(e) => { e.stopPropagation(); console.log("Button clicked"); }} > Click Me </button> Now only this runs: Button clicked 🛒 Real-World Example Imagine a clickable product card: <div onClick={() => navigate("/product/1")}> <button onClick={addToCart}> Add to Cart </button> </div> Without stopPropagation(), clicking “Add to Cart” will also navigate to the product page. Solution: <button onClick={(e) => { e.stopPropagation(); addToCart(); }} > Add to Cart </button> Now: ✅ The product is added to cart ✅ No unwanted navigation Understanding event propagation is essential for building predictable and clean UI behavior in React applications. Small detail. Big impact. #React #JavaScript #FrontendDevelopment #WebDevelopment

Day 19 of #30DaysOfJavaScript: Built a Simple Notes App! Started with a clean architecture. DOM elements mapped to variables for easy reference. Implemented CRUD operations: create notes with unique IDs (using timestamp + random string), open/edit existing notes, save to localStorage, and delete with confirmation. Real-time search filters notes by title and content using .includes() and .toLowerCase(). Built XSS protection by sanitizing HTML special characters before rendering to prevent injection attacks. Keyboard shortcuts added for power users Ctrl+N creates a note, Ctrl+S saves instantly. Used event delegation and localStorage API for persistent data storage across sessions. Every note tracks its updatedAt timestamp. The UI shows live previews with metadata. Pure vanilla JS—no frameworks, no dependencies. Fast, lightweight, and production-ready. Live: https://lnkd.in/dmsPwaJp #JavaScript #WebDevelopment #FrontendCoding #30DaysOfJS #VanillaJS #localStorage #Netlify

💡 React Tip: Many developers misuse useMemo Today I was reviewing some React code and noticed something interesting — a lot of developers use useMemo in places where it's actually not needed. useMemo is useful when you have an expensive calculation that shouldn't run on every render. It memoizes the result and only recalculates when the dependencies change. But a common mistake is using useMemo for simple values or lightweight operations. Example of unnecessary use: const doubled = useMemo(() => count * 2, [count]); In this case, React can calculate count * 2 instantly, so useMemo adds extra complexity without real benefit. A better use case would be something like filtering a large list: const filteredUsers = useMemo(() => { return users.filter(user => user.isActive); }, [users]); Here, useMemo helps avoid recalculating the filtered list on every render. 👉 Lesson: useMemo is a performance optimization tool, not something to use everywhere. Curious to know — how often do you use useMemo in your projects? #reactjs #javascript #frontenddeveloper #webdevelopment

⚛️ Stop using useEffect for everything. One of the biggest shifts in my React journey was realizing this: 👉 Not everything belongs in useEffect. At the beginning, I used useEffect for: calculations derived state syncing values even simple logic 🤦♂️ It “worked”… but it made my components: ❌ harder to read ❌ harder to debug ❌ less predictable Then I learned the key idea: 💡 If something can be calculated during render — do it there. Example mistake: Using useEffect to calculate filtered data. Better: Just compute it directly in render. React is designed to re-render. Let it do its job. 👉 useEffect should be used only for: API calls subscriptions interacting with external systems Not for internal logic. 🎯 My rule now: “If it doesn’t touch the outside world — it doesn’t need useEffect.” This one mindset shift made my code: ✔️ cleaner ✔️ more predictable ✔️ easier to maintain Curious — what was your biggest “aha moment” with React? 👇 #ReactJS #FrontendDevelopment #JavaScript #CleanCode #WebDevelopment #SoftwareEngineering