Sabeer Rahman’s Post

🚀 useReducer in React — When useState is Not Enough As your React app grows… 👉 State becomes complex 👉 Multiple updates depend on each other 👉 Logic gets messy That’s where useReducer comes in. 💡 What is useReducer? useReducer is a hook for managing complex state logic using a reducer function. 👉 Inspired by Redux ⚙️ Basic Syntax const [state, dispatch] = useReducer(reducer, initialState); 🧠 How it works 👉 Instead of updating state directly: setCount(count + 1); 👉 You dispatch actions: dispatch({ type: "increment" }); 👉 Reducer decides how state changes: function reducer(state, action) { switch (action.type) { case "increment": return { count: state.count + 1 }; default: return state; } } 🧩 Real-world use cases ✔ Complex forms ✔ Multiple related states ✔ State transitions (loading → success → error) ✔ Large components with heavy logic 🔥 Why useReducer? 👉 useState works well for simple state 👉 useReducer works better for structured logic 🔥 Best Practices (Most developers miss this!) ✅ Use when state depends on previous state ✅ Use for complex or grouped state ✅ Keep reducer pure (no side effects) ❌ Don’t use for simple state ❌ Don’t mix business logic inside components ⚠️ Common Mistake // ❌ Side effects inside reducer function reducer(state, action) { fetchData(); // ❌ Wrong return state; } 👉 Reducers must be pure functions 💬 Pro Insight (Senior-Level Thinking) 👉 useState = simple updates 👉 useReducer = predictable state transitions 👉 If your state has “rules” → useReducer 📌 Save this post & follow for more deep frontend insights! 📅 Day 20/100 #ReactJS #FrontendDevelopment #JavaScript #ReactHooks #StateManagement #SoftwareEngineering #100DaysOfCode 🚀

Is your website losing users before it even loads? 📉⚡ As a Front-End Developer, I’ve learned that a beautiful UI is meaningless if the performance is sluggish. Research shows that even a 1-second delay in page load time can lead to a significant drop in conversions. If you are building with React or Next.js, here are 3 high-impact ways I optimize performance to keep that Lighthouse score in the green: 1️⃣ Smart Image Optimization: Stop serving massive 5MB JPEGs. Use the Next.js <Image /> component for automatic resizing, lazy loading, and serving modern formats like WebP/AVIF. 2️⃣ Code Splitting: Don't make your users download the entire app at once. Use Dynamic Imports or React.lazy() to load components only when they are actually needed. 3️⃣ Memoization: Prevent unnecessary re-renders. Use useMemo and useCallback to cache expensive calculations and functions, keeping your UI snappy. Performance isn't a "one-time task"—it’s a mindset. Building fast apps is just as important as building functional ones. What’s your #1 tip for speeding up a React application? Let’s talk performance in the comments! 👇 #WebPerformance #ReactJS #NextJS #FrontendDeveloper #ProgrammingTips #JavaScript #CodingLife

Ever spent hours debugging a seemingly simple dropdown menu only for it to misbehave within a scrollable table or container? It’s a classic web development challenge that often leads to quick fixes and more frustration. What initially appears random clipping, drifting, or z-index wars is actually a predictable collision of three core browser systems: overflow, stacking contexts, and containing blocks. Understanding their interplay fundamentally changes how you approach these bugs, transforming them from unpredictable headaches into solvable, logical problems. In my work with Laravel, React, and even Flutter web applications, I've consistently found that a deep understanding of these browser mechanisms is paramount. Whether it's crafting an action menu for a data-rich Laravel dashboard or designing responsive interfaces with React, knowing when to leverage `createPortal`, the new HTML Popover API, or the evolving CSS Anchor Positioning, makes all the difference. It's about choosing the right tool for the job – sometimes it's a JavaScript-driven portal for maximum reliability, other times it's a simple DOM restructure, or even a progressive enhancement with CSS Anchor Positioning. Crucially, accessibility isn't an afterthought; it's foundational to a robust solution. This holistic perspective on frontend challenges ensures that the UIs we build are not just functional, but truly resilient, accessible, and deliver an exceptional user experience, saving significant development time and improving user satisfaction in the long run. What's been your most challenging "dropdown-in-scroll-container" war story, and how did you conquer it? #WebDevelopment #FrontendChallenges #UIUX #SoftwareEngineering #TechConsulting #BangladeshTech

🚀 Understanding Next.js Project Structure (App Router) – Explained Simply If you're starting with Next.js, one thing that can confuse even experienced developers is the project structure. Let’s break it down in a clean, practical way 👇 📁 1. app/ (🔥 Heart of Next.js) This is where everything happens in modern Next.js. page.js → Represents a route (like /about) layout.js → Shared layout (header, footer) loading.js → Loading UI error.js → Error handling Nested folders = Nested routes 👉 Example: app/blog/page.js → /blog 📁 2. components/ Reusable UI parts (buttons, cards, modals) 👉 Best practice: Keep your UI clean and reusable here 📁 3. public/ Static files like: Images Icons Fonts 👉 Direct access: /logo.png 📁 4. styles/ Global styles or CSS modules 👉 Most developers now prefer: Tailwind CSS 🔥 📁 5. api routes (inside app) Backend logic inside frontend! 👉 Example: app/api/users/route.js GET → Fetch data POST → Save data 👉 Think like Laravel Controllers ⚡ 📁 6. lib / utils / Helper functions, API configs, DB connections 👉 Example: DB connection Common functions 📁 7. middleware.js Runs before request hits page 👉 Use cases: Authentication check Redirect logic 📁 8. next.config.js Project configuration file 👉 Used for: Image domains Environment configs Build settings 💡 Pro Tip (From Real Experience) If you come from PHP/Laravel: app/ → like routes + views api/ → like controllers lib/ → like helpers/services 🔥 Why This Structure is Powerful? ✔ Clean separation ✔ Full-stack in one project ✔ Better performance (Server Components) ✔ SEO friendly 💬 Final Thought Mastering the project structure is the first step to building scalable, production-ready apps in Next.js. Once this clicks, everything else becomes easier. #NextJS #WebDevelopment #FullStack #React #JavaScript #Developers #Programming #Laravel #Frontend #Backend

𝗥𝗲𝗮𝗰𝘁 𝗶𝘀 𝘀𝘁𝗶𝗹𝗹 𝗼𝗻𝗲 𝗼𝗳 𝘁𝗵𝗲 𝗯𝗲𝘀𝘁 𝘁𝗼𝗼𝗹𝘀 𝗳𝗼𝗿 𝗯𝘂𝗶𝗹𝗱𝗶𝗻𝗴 𝗺𝗼𝗱𝗲𝗿𝗻 𝘄𝗲𝗯 𝗮𝗽𝗽𝘀. Not because it’s trendy. Because it helps developers create: → reusable components → scalable interfaces → fast user experiences → structured codebases → dynamic applications But React alone isn’t the edge anymore. The edge comes from knowing how to use React with: • performance best practices • modern JavaScript patterns • AI-powered features • SEO-aware architecture • user behavior insights Tools matter. But how you think while using them matters more. That’s what separates developers who build pages… from developers who build products. What do you think is the most underrated React skill? #ReactJS #FrontendDevelopment #JavaScript #WebApps #SoftwareDeveloper #TechLeadership

The React Hook "Periodic Table": From Basics to Performance ⚛️ If you want to write clean, professional React code in 2025, you need more than just useState. While useState is the heart of your component, these 7 hooks form the complete toolkit for building scalable, high-performance apps. Here is the breakdown: 🌟 The Core Essentials 1️⃣ useState: The bread and butter. Manages local state (toggles, form inputs, counters). 2️⃣ useEffect: The "Swiss Army Knife." Handles side effects like API calls, subscriptions, and DOM updates. 3️⃣ useContext: The prop-drilling killer. Shares global data (themes, user auth) across your entire app without passing props manually. ⚡ The Performance Boosters 4️⃣ useMemo: Caches expensive calculations. Don't re-run that heavy data filtering unless your dependencies actually change! 5️⃣ useCallback: Memoizes functions. Perfect for preventing unnecessary re-renders in child components that rely on callback props. 🛠️ The Power Tools 6️⃣ useRef: The "Persistent Finger." Accesses DOM elements directly (like auto-focusing an input) or stores values that persist without triggering a re-render. 7️⃣ useReducer: The "Traffic Cop." Best for complex state logic where multiple sub-values change together. If your useState logic is getting messy, this is your solution. 💡 Pro-Tip : Keep an eye on React 19 hooks like useOptimistic (for instant UI updates) and useFormStatus (to simplify form loading states). The ecosystem is moving fast! Which hook do you find yourself reaching for the most lately? Is there a custom hook you’ve built that you now use in every project? 👇 #ReactJS #WebDevelopment #Frontend #CodingTips #Javascript #SoftwareEngineering #ReactHooks #WebDev2025

After working on state, routing, and UI in earlier projects, I wanted to build something that depends on external data and real-time updates 🌍 Built a Weather App where you can search any city and get current conditions in a clean, responsive UI 🌦️ What this added for me 1. Working with API data instead of static state 2. Handling loading and error states properly 3. Keeping the UI clear even when data changes dynamically 📱 Stack: React, Vite, Tailwind CSS, Vercel 🔗 Live: https://lnkd.in/gZGcnUFS 💻 Code: https://lnkd.in/gasfj-vK Still building and improving, open to feedback or connections 👍 #React #JavaScript #FrontendDevelopment #WebDevelopment #BuildInPublic #LearningInPublic #API #Vite #TailwindCSS #DevCommunity #TechCareers #SoftwareDevelopment Error Makes Clever

 Excited to share my latest project: The Daily Life Planner 🚀 I just wrapped up a full-stack React application focused on productivity and clean UI. This isn't just another To-Do list; it’s a fully functional CRUD app integrated with a JSON Server backend to ensure persistent data management. Key Features: ✅ Full CRUD Functionality: Create, Read, Update, and Delete tasks seamlessly via REST API. 📊 Live Progress Tracking: Visual feedback on task completion using dynamic progress bars. 🎨 Modern Dark UI: A custom-styled, immersive "fullscreen" experience built with CSS Grid and Flexbox. ⚡ Asynchronous State: Managed with React useEffect and useState for a smooth, lag-free user experience. Tech Stack: React.js, Vite, JSON Server (REST API), and Custom CSS. Check out the code here: [Insert GitHub Link] #ReactJS #WebDevelopment #Frontend #Programming #JavaScript #UIUX #ProductivityTools

🚀 React Project: JSON Explorer I built a small web application that allows users to paste any JSON API URL and instantly visualize the returned data in a clean and structured format. Key Features ✔ Fetch data from any JSON API ✔ Loading and error handling ✔ Clean UI for easy JSON visualization ✔ “Load More” functionality for large datasets Tech Stack: React | JavaScript | CSS 🔗 Try the app: https://lnkd.in/gQDirDAn This project helped me strengthen my understanding of API integration, React state management, and dynamic UI rendering. #ReactJS #FrontendDevelopment #JavaScript #WebDevelopment #API #LearningByBuilding

🚀 Understanding React Routing (Simplified) Just created this quick visual to break down React Routing concepts in a clean and structured way. Here’s the core idea 👇 🔹 Types of Routing Declarative → Uses predefined components Data / Custom → Build your own logic Framework → Full control from scratch 🔹 Declarative Routing (Most Common) Uses BrowserRouter Works with Context API Routes defined using <Route> Nested routes handled with <Outlet /> UI-first approach (render first, fetch later) 🔹 Key Concept Routing is basically about showing UI based on URL (path). 🔹 Nested Routing Parent component contains <Outlet /> Child routes render inside that space 🔹 When to Use What? Declarative → Best for most apps (simple, fast, scalable) Custom/Data routing → Useful for complex, dynamic apps 💡 Simple takeaway: Start with declarative routing. Master it. Then explore advanced routing patterns. Trying to turn my handwritten notes into clean visuals like this to improve clarity. Let me know if this helped or if you want more breakdowns like this 👇 #React #WebDevelopment #Frontend #JavaScript #CodingJourney #LearningInPublic