Priyank Sharma’s Post

🚀 Code Splitting in React — Best Practices & Why It Matters Ever noticed your React app taking time to load? 🤔 That’s often because everything loads at once… 👉 This is where Code Splitting comes in ⚡ 🧩 What is Code Splitting? 👉 Break your app into smaller chunks 👉 Load only what’s needed Instead of loading the entire app at once, React loads components on demand 💡 ⚙️ Basic Example js import React, { Suspense, lazy } from "react"; const Dashboard = lazy(() => import("./Dashboard")); export default function App() { return ( <Suspense fallback={<p>Loading...</p>}> <Dashboard /> </Suspense> ); } 🧠 Best Practices ✔ Use `React.lazy()` for components ✔ Wrap with `Suspense` for fallback UI ✔ Split routes (page-level splitting) ✔ Avoid over-splitting (too many small chunks) ✔ Combine with dynamic imports ⚡ Why It Matters? ✔ Faster initial load time ✔ Better performance ✔ Improved user experience ✔ Reduced bundle size 🔥 Real-world Usage 👉 Large dashboards 👉 E-commerce apps 👉 Admin panels 👉 Feature-based modules 🧠 Simple Way to Understand • Without Code Splitting → Load everything 🚫 • With Code Splitting → Load only needed parts ✅ 💬 Are you using code splitting in your project or still loading everything at once? --- #React #Frontend #WebPerformance #JavaScript #WebDevelopment #Coding #SoftwareEngineering

🚀React Bundle Analysis & Optimization Your React app might look fine… But if your bundle is heavy, users will feel the slowdown ⚠️ Let’s break this down simply 👇 🧩 What is a Bundle? 👉 When you build a React app, all your code + libraries are combined into JavaScript files (bundles) 💡 Example: • React • UI libraries • Utility functions ➡️ All packed into one or multiple JS files ⚠️ Why Large Bundles Are a Problem ❌ Slow initial load ❌ More JavaScript to execute ❌ Poor performance on low-end devices 👉 Bigger bundle = Slower app 🔍 What is Bundle Analysis? 👉 It helps you understand: • Which library is heavy • What is increasing bundle size • Where optimization is needed 📊 Tools give a visual breakdown of your bundle 🛠️ Tools You Can Use ✔ webpack-bundle-analyzer ✔ source-map-explorer 👉 Shows which dependency is taking the most space ⚡ How to Optimize Bundle 🧩 1. Code Splitting → Break bundle into smaller chunks ⚡ 2. Lazy Loading → Load components only when needed 🌳 3. Tree Shaking → Remove unused code automatically 📦 4. Dynamic Imports → Load heavy modules on demand 🧹 5. Remove Heavy Libraries → Replace with lighter alternatives 🔥 Real Impact ✔ Faster load time ✔ Better performance ✔ Improved user experience ✔ Smaller bundle size 🧠 Simple Way to Understand • Without Optimization → Big bundle → Slow app ❌ • With Optimization → Small chunks → Fast app ✅ 💬 Have you ever checked what’s inside your bundle? #React #WebPerformance #Frontend #JavaScript #WebDevelopment #Optimization #Coding #SoftwareEngineering

🚀 𝗗𝗲𝗰𝗼𝗱𝗲 𝗠𝗘𝗥𝗡 𝘄𝗶𝘁𝗵 𝗠𝗲 – 𝗗𝗮𝘆 𝟳 Today’s focus wasn’t just UI… It was about writing smarter React code. I explored 𝗖𝘂𝘀𝘁𝗼𝗺 𝗛𝗼𝗼𝗸𝘀— a concept that changes how you structure your applications. Instead of repeating logic in multiple components, I learned how to extract it into a reusable function. So I built a simple project to apply it 👇 📌 𝗣𝗿𝗼𝗷𝗲𝗰𝘁: Notes App with Auto Save A minimal app, but with a strong concept behind it. ✔ Notes are saved automatically ✔ Data persists even after refresh ✔ No backend used — everything handled in the browser ✔ Clean and simple UI with Tailwind CSS ⚙️ 𝗪𝗵𝗮𝘁 𝗺𝗮𝗱𝗲 𝗶𝘁 𝗶𝗻𝘁𝗲𝗿𝗲𝘀𝘁𝗶𝗻𝗴? I created a custom hook: useLocalStorage This hook handles: • State management • Data storage • Sync between UI and localStorage One hook → reusable logic → cleaner components 🧠 𝗞𝗲𝘆 𝗧𝗮𝗸𝗲𝗮𝘄𝗮𝘆: When your logic is reusable, your code becomes scalable. And that’s where React starts to feel powerful. 🔗 𝗖𝗼𝗱𝗲: https://lnkd.in/gBuMk4TG Learning one concept at a time. Building one project at a time. #MERN #ReactJS #CustomHooks #WebDevelopment #LearningInPublic #100DaysOfCode

🚀 Day 22/30 – Folder Structure (Scalable React Apps) Most React projects don’t fail because of code… 👉 They fail because of bad structure 😵 Today I learned how real-world React apps are structured ⚡ 👉 Folder Structure (Industry Level) 💻 The Problem: Everything works fine… until your app grows 👀 ❌ Files everywhere ❌ Hard to find logic ❌ Debugging becomes painful 💻 The Solution: 👉 Feature-based architecture (used in production) ✅ 📁 Example Structure: src/ ┣ app/ → app setup (store, providers) ┣ features/ → business logic (modular) ┃ ┣ auth/ ┃ ┃ ┣ components/ ┃ ┃ ┣ pages/ ┃ ┃ ┣ services/ ┃ ┃ ┣ hooks/ ┃ ┃ ┗ authSlice.js ┃ ┣ user/ ┃ ┗ product/ ┣ shared/ → reusable code ┃ ┣ components/ ┃ ┣ hooks/ ┃ ┣ utils/ ┃ ┗ constants/ ┣ services/ → API config ┣ routes/ → routing ┣ layouts/ → layouts ┣ assets/ → images ┣ App.jsx ┗ main.jsx 💡 Why this is powerful: ✅ Each feature is isolated ✅ Easy to scale without chaos ✅ Teams can work independently 🔥 Reality Check: 👉 Small apps → basic structure works 👉 Real apps → need architecture ⚡ Advanced Insight: Most beginners organize by file type ❌ Real developers organize by feature/domain ✅ 🔥 Key Takeaway: Clean architecture > clean code Be honest 👇 Are you still using basic folders… or building scalable apps? 🚀 #React #FrontendDevelopment #JavaScript #CleanCode #Architecture

💡 Sharing one of my previous projects: I developed a **Weather Web App** using API integration 🌦️ 🔹 Features: • Fetches real-time weather data for any city • Displays Temperature, Min Temp, Max Temp • Shows Humidity levels • Simple and responsive UI 🔧 Tech Stack: • React (Vite) • Tailwind CSS • Weather API Through this project, I gained hands-on experience in working with APIs and handling dynamic data. 🔗 GitHub Repository: https://lnkd.in/dwSmGdPC Open to feedback and suggestions! #WebDevelopment #ReactJS #Frontend #API #Projects

Stop overcomplicating your React state! 🛑 One of the most common questions for React developers is: "When do I move from useState to useReducer?" While useState is the go-to for most scenarios, choosing the right tool can save you from a "spaghetti code" nightmare as your application scales. Here is a quick breakdown based on the visual guide below: ✅ 𝘂𝘀𝗲𝗦𝘁𝗮𝘁𝗲: 𝗧𝗵𝗲 𝗦𝗶𝗺𝗽𝗹𝗲 𝗔𝗽𝗽𝗿𝗼𝗮𝗰𝗵 Think of this as your "quick-start" tool. It is perfect when you have independent pieces of state that don’t rely on each other. Pros: Minimal boilerplate, easy to learn, and keeps components lean. Cons: Logic can become scattered across your component, making multiple state updates harder to manage. Best for: Dark mode toggles, simple form inputs, and modals. 🚀 𝘂𝘀𝗲𝗥𝗲𝗱𝘂𝗰𝗲𝗿: 𝗧𝗵𝗲 𝗦𝗰𝗮𝗹𝗮𝗯𝗹𝗲 𝗔𝗽𝗽𝗿𝗼𝗮𝗰𝗵 When your state transitions get complex (like a shopping cart or a multi-step wizard), useReducer is your best friend. It centralizes all your update logic into one function. Pros: Predictable state transitions, centralized logic, and much easier to maintain as your app grows. Cons: Requires more "upfront" code (boilerplate) and has a slightly steeper learning curve. Best for: Shopping carts, complex dashboards, and data-heavy wizards. 𝗧𝗵𝗲 𝗥𝘂𝗹𝗲 𝗼𝗳 𝗧𝗵𝘂𝗺𝗯: If you find yourself writing multiple useState calls that change together, or if your update logic is getting hard to read, it’s time to switch to useReducer. Check out the comparison chart below to see how these two look in a real-world shopping cart scenario! 👇 #ReactJS #WebDevelopment #Frontend #JavaScript #Hooks

Ever wondered why modern web apps load so fast? Let’s break down a cool concept called **Tree Shaking** Imagine your codebase is a big tree full of branches (functions, variables, features). But your app only needs a few of those branches to run. 👉 Tree shaking removes all the unused branches 👉 So only the *necessary code* is included in the final bundle Result? ⚡ Smaller file size ⚡ Faster load times ⚡ Better performance --- Now, how do we actually do this? We use **modern bundlers** like: • ⚡ Vite – super fast, uses native ES modules • 📦 Webpack – powerful and widely used • 🧩 Rollup – great for libraries --- 💡 Pro tip: Tree shaking works best when you use **ES Modules (import/export)** instead of older `require()` syntax. --- In short: 👉 Write modular code 👉 Use modern bundlers 👉 Let tree shaking do the cleanup Clean code = Fast apps 🚀 #WebDevelopment #JavaScript #Frontend #Performance #CodingTips

Your React app feels slow. But your API is fast. Your database is fine. Your bundle is optimized. The problem is the main thread. And most developers don't know how to fix it. Here's the pattern I use to make complex React UIs feel instant — without touching the backend. The scenario: a search input that filters a massive list. Every keystroke triggers a re-render of 1000+ items. The UI stutters. The input feels laggy. Users think the app is broken. The old fix? Debounce. Add a 300ms delay, hope users don't notice the input freeze. The real fix? React's Concurrent rendering with useTransition + useDeferredValue. Here's the difference: Without it — every keystroke = immediate re-render of everything = main thread blocked = janky input. With useTransition: const [isPending, startTransition] = useTransition() startTransition(() => setQuery(value)) React now knows: "this state update is low priority." It keeps the input responsive, renders the list in the background, and only commits when ready. With useDeferredValue: const deferredQuery = useDeferredValue(query) The list re-renders with the deferred value — always one step behind the input. Input stays snappy. List catches up smoothly. I used this exact pattern on a large-scale dashboard with real-time data filtering across thousands of records. Input lag: gone. User complaints: gone. Zero backend changes needed. The mental model shift: not all state updates are equal. React 18 lets you tell the browser which ones can wait. Are you still debouncing everything? Try useTransition instead. Your users will feel the difference immediately. Which React 18 feature has surprised you the most in production? Drop it below. 👇 #ReactJS #Frontend #WebDev #React18 #JavaScript #TypeScript #UIPerformance #BuildingInPublic

 New Project Live — Real-Time Weather App Hey everyone! 👋 I recently built and deployed a Real-Time Weather Application as part of my web development journey. 🌦️ This app provides live weather updates for any city using API integration. 🔧 Tech Stack Used: ✅ React.js ✅ Vite ✅ OpenWeather API ✅ HTML, CSS, JavaScript ✨ Features: Real-time weather data Clean & responsive UI Fast performance with Vite Search any city instantly 🔗 Live Demo: 👉 [ New Project Live — Real-Time Weather App Hey everyone! 👋 I recently built and deployed a Real-Time Weather Application as part of my web development journey. 🌦️ This app provides live weather updates for any city using API integration. 🔧 Tech Stack Used: ✅ React.js ✅ Vite ✅ OpenWeather API ✅ HTML, CSS, JavaScript ✨ Features: Real-time weather data Clean & responsive UI Fast performance with Vite Search any city instantly 🔗 Live Demo: -👉 https://lnkd.in/gCk5x6wM] 💬 I’d love your feedback and suggestions! #ReactJS #WebDevelopment #FrontendDeveloper #JavaScript #Projects #OpenWeatherAPI #Vite #LearningInPublic] 💬 I’d love your feedback and suggestions! #ReactJS #WebDevelopment #FrontendDeveloper #JavaScript #Projects #OpenWeatherAPI #Vite #LearningInPublic

🚀 Day 21/30 – Mini Project (API-Based App) Time to apply everything I’ve learned so far 💻🔥 Today I built my first API-based React project ⚡ 👉 Project: User List App --- 💻 Features: ✅ Fetch data from API ✅ Display users dynamically ✅ Loading state handling ✅ Error handling --- 💻 Code: import { useEffect, useState } from "react"; function App() { const [users, setUsers] = useState([]); const [loading, setLoading] = useState(true); const [error, setError] = useState(null); useEffect(() => { fetch("https://lnkd.in/gK2x-6hi") .then((res) => { if (!res.ok) throw new Error("Failed to fetch"); return res.json(); }) .then((data) => { setUsers(data); setLoading(false); }) .catch((err) => { setError(err.message); setLoading(false); }); }, []); if (loading) return <h2>Loading...</h2>; if (error) return <h2>Error: {error}</h2>; return ( <> {users.map((user) => ( <h3 key={user.id}>{user.name}</h3> ))} </> ); } --- 🔥 What I applied: - useState (state management) - useEffect (API calls) - Conditional rendering (loading/error) - Lists & keys --- 💡 Key Learning: 👉 Real React starts when you connect UI with API --- 🔥 Key Takeaway: Projects > Theory 👉 Building is the best way to learn. (Adding demo / GitHub link in comments 👇) #React #Projects #FrontendDevelopment #JavaScript #WebDevelopment