Optimize React UI with React Profiler

Is poor state architecture the real reason your React app is hard to scale? Full guide: https://lnkd.in/d9Ayg3gM ➤ In most codebases, yes. • Props: parent-to-child only • Local State: UI & form interactions • Context API: auth, themes, no prop drilling • Redux: large-scale apps only • Hooks: performance & global state access ➤ Golden rule: keep state as local as possible. ➤ Simplicity before premature complexity. #ReactJS #FrontendDevelopment #StateManagement #Redux #JavaScript

Day 17 #100DaysOfCode 💻 Today I learned how to set up a React project and organize components. I installed Tailwind CSS and DaisyUI to build UI faster. Then I started creating reusable component files like NavBar.jsx and Banner.jsx to keep the project clean and structured. Example: import NavBar from "./components/NavBar" import Banner from "./components/Banner" function App() { return ( <> <NavBar /> <Banner /> </> ) } export default App Breaking the UI into components makes React projects easier to manage and scale. #React #FrontendDevelopment #JavaScript #WebDevelopment #Akbiplob

Today everything started to feel… more real. React Masterclass (Day 5). I began with: • Sharing state between components • Passing functions as props • Understanding how React handles state updates But instead of stopping there, I asked: How would this actually work in a real app? 💰 So I built a Budget Tracker: • Set initial balance • Add expenses that reduce it in real-time • Dynamic UI based on current state • Data persisted using localStorage • Clean updates using functional state 💡 Key concepts that clicked: • Lazy initialization (run logic only once) • Functional updates (state based on previous state) • Derived values (calculating remaining balance) Small concepts → Real product thinking. #React #Frontend #WebDevelopment #LearningInPublic #JavaScript

Day 20: React Performance Optimization (React.memo) As your React app grows, performance becomes important. Sometimes, your component re-renders even when it doesn’t need to This is where React.memo helps. 📌 What is React.memo? React.memo is a Higher Order Component (HOC) that prevents unnecessary re-renders. 👉 It re-renders the component only when props change. 📌 Why React.memo is useful? By default, when a parent component re-renders, all child components also re-render. Even if the child doesn’t need to update ❌ React.memo helps avoid this. 📌 Example Without React.memo function Child({ name }) { console.log("Child rendered"); return <h2>Hello {name}</h2>; } Child re-renders every time parent re-renders. 📌 Example With React.memo import React from "react"; const Child = React.memo(({ name }) => { console.log("Child rendered"); return <h2>Hello {name}</h2>; }); export default Child; Now the Child component will re-render only if name changes ✅ 📌 When should you use React.memo? ✅ When component is heavy (large UI, complex calculations) ✅ When props rarely change ✅ When unnecessary re-renders are happening 📌 When NOT to use React.memo? ⚠️ Don’t use it everywhere. It adds extra comparison cost. Use it only when performance is actually needed. 📌 Interview Tip 👉 React.memo is used for component memoization (avoiding re-render unless props change) #ReactJS #ReactMemo #FrontendDevelopment #JavaScript #WebDevelopment #PerformanceOptimization #CodingJourney

"useEffect" vs. "useLayoutEffect": Are you using the right React hook? 🤔 In React, both "useEffect" and "useLayoutEffect" manage side effects, but their timing is what sets them apart—and choosing the wrong one can impact your app's performance. Here's a quick breakdown: "useEffect" - Timing: Runs asynchronously after the component renders and the browser has painted the screen. Performance: Non-blocking. It won’t slow down the user interface, making it perfect for most side effects. Best For: Fetching data from an API Setting up subscriptions Managing timers "useLayoutEffect" - Timing: Runs synchronously after all DOM mutations but before the browser paints the screen. Performance: Can block the rendering process. Use it sparingly to avoid a sluggish UI. Best For: Reading layout from the DOM (e.g., getting an element's size or position). Making immediate visual updates based on those measurements to prevent flickering. The Golden Rule 🏆 Always start with "useEffect". Only switch to "useLayoutEffect" if you are measuring the DOM and need to make synchronous visual updates before the user sees the changes. Understanding this distinction is crucial for building performant and seamless React applications. #ReactJS #WebDevelopment #JavaScript #FrontEndDev #Performance #CodingTips #ReactHooks

React keys are often treated like a small detail. But in real apps, they decide something very important: identity. A key tells React whether a component is the same one as before, or a new one that should be created again. That sounds simple. But it affects state, reuse, and how stable the UI feels. When keys are stable, React can keep the right state in the right place. When keys change in the wrong way, React may reuse the wrong component. That is when strange issues start showing up. Inputs lose focus. Values appear in the wrong row. Some parts of the UI behave in ways that are hard to explain. This is why I do not think of keys as just a React requirement. I think of them as part of system design. If the data has a clear identity, the UI becomes predictable. If the identity is weak or unstable, the UI starts to break in subtle ways. One simple rule helps a lot: Use something stable as the key. Not position. Not something that changes when the list changes. Small detail in code. Big impact in behavior. #ReactJS #FrontendArchitecture #JavaScript #WebDevelopment

🧠 Part 3 of 10: Duplicated state is one of the fastest ways to make a React app feel unstable. Everything looks fine at first. Then one value updates. The other one doesn’t. Now the UI technically works, but nobody fully trusts it. That’s the part people don’t say enough: a lot of frontend bugs are really trust issues. The UI says one thing. The data says another. Now the team starts building around confusion. Whenever I can, I try to keep state close to a single source of truth. It makes code easier to reason about. And future changes get a lot less annoying. What bug have you traced back to duplicated state? #React #ReactJS #FrontendEngineering #StateManagement #JavaScript #UIEngineering #WebDevelopment

Most React developers use keys wrong in lists. And it silently breaks their app. 😅 This is what everyone does: // ❌ Using index as key {users.map((user, index) => ( <UserCard key={index} user={user} /> ))} Looks fine. Works fine. Until it doesn't. The problem: If you add/remove/reorder items — React uses the index to track components. Index changes → React thinks it's a different component → Wrong component gets updated → Bugs that are impossible to debug. 💀 Real example: // You have: [Alice, Bob, Charlie] // You delete Alice // Now: [Bob, Charlie] // Index 0 was Alice, now it's Bob // React reuses Alice's DOM node for Bob // State gets mixed up! // ✅ Always use unique ID as key {users.map((user) => ( <UserCard key={user.id} user={user} /> ))} Rule I follow: → Never use index as key if list can change → Always use unique stable ID → Only use index for static lists that never change This one mistake caused a 2 hour debugging session for me. 😅 Are you using index as key? Be honest! 👇 #ReactJS #JavaScript #Frontend #WebDevelopment #ReactTips #Debugging

Most React apps are slow for one reason: we treat everything like client state. The biggest unlock is deciding what should not be interactive. Ship less JavaScript. Render more on the server. Keep components boring. Make state local by default. React isn’t hard because of hooks. React is hard when we skip architecture. Build for clarity first, and performance usually follows. What’s one thing your team stopped doing that made your React app noticeably better? #React #Frontend #WebDevelopment #JavaScript #SoftwareEngineering

Today I explored React Router and key concepts behind Single Page Applications (SPA). 🔹 SPA – Loads a single HTML page and dynamically updates content without full page reloads. Example: Facebook, Gmail. 🔹 React SPA – Component-based SPA built with React. Each UI part is a reusable component. 🔹 Routing – Controls which component shows based on the URL, keeping navigation fast. 🔹 Nested Routing & Outlet – Parent routes can have child routes, and Outlet decides where the child renders. Example: Dashboard → Profile / Settings. 🔹 Link & NavLink – Link navigates without reload; NavLink highlights active routes. 🔹 Loader & useLoaderData – Fetch data before route renders and access it in the component easily. 🔹 Params & Dynamic Routes – Capture dynamic URL values with: id and useParams(). Example: /user/5 → id = 5. 🔹 useNavigate – Programmatically navigate between routes. Example: Redirect after form submission. Understanding these makes building scalable and smooth React apps much easier! #React #SPA #Frontend #WebDevelopment #JavaScript