Why Your JavaScript App Crashes and How to Fix It

Interviewer: How do you improve performance in a React app? Here's how you answer it 👇 We can reduce JS bundle size by 40% and improve load time by 1.2s with just 3 things — 1️⃣ Lazy load everything you don't need on first render ```js const Dashboard = React.lazy(() => import('./Dashboard')) ``` Users shouldn't download code for pages they haven't visited yet. 2️⃣ Dynamic imports for heavy libraries ```js const { default: heavyLib } = await import('heavy-library') ``` Don't bundle what you only need sometimes. 3️⃣ Memoize expensive components ```js const Card = React.memo(({ data }) => <div>{data.title}</div>) ``` Stop unnecessary re-renders before they happen. Three changes. Real impact. Please add your go-to performance fix below 👇 #Frontend #ReactJS #WebPerformance #InterviewPrep #JavaScript

Why does your app "freeze" during big tasks? Even with 5 years of experience, this one still trips people up. JavaScript is "single-threaded." This means it can only do one thing at a time. The Problem: If you run a heavy calculation, the app cannot "draw" the UI or handle touches until that task is finished. Example (The Bad Way): // This freezes the screen for 5 seconds! const processData = () => { for(let i = 0; i < 1000000000; i++) { // Heavy work... } console.log("Done!"); } The Fix: Break big tasks into small pieces or move them to a "Worker." In React Native, keep the "Main Thread" free so your animations stay smooth. Senior Rule: Never block the UI. If a task takes more than 100ms, it shouldn't be on the main thread. #JavaScript #ReactNative #Coding #Performance #SimpleCoding

#JourneyToTechJob – Day 12 🚀 #50DaysOfRevision Focused on revising JavaScript concepts by preparing to build a Counter App. ✔️ Revisited DOM manipulation ✔️ Practiced event handling ✔️ Understood how to update UI dynamically Breaking down the logic before building helps in writing better code. Looking forward to implementing it next. #SoftwareDevelopment #FrontendDevelopment #BackendDevelopment #JavaScript #WebDevelopment #BuildInPublic #Consistency #50DaysOfCodeChallenge

🧩 Side project update — Picture Reveal Game I've been building a Picture Reveal feature for my web app. The concept is simple: a host progressively reveals tiles on an  image while players race to guess the answer. The more tiles  revealed, the lower the score — easy to play, hard to master 🎯 A few things I'm proud of on the technical side: → Temp → finalize upload pipeline  Prevents orphaned files if a user exits without saving → Special tile patterns (plus, diagonal, ring, wide-plus)  Opening one tile automatically reveals neighbors in a pattern → Soft delete across games and images  Keeps historical data intact without hard removal → Fully configurable scoring per game  (startScore, openTilePenalty, specialTilePenalty) Stack: Next.js 16.2 · React 19 · TypeScript ·  Drizzle ORM (MySQL) · Zod · Zustand Currently looking for an experienced developer to do a code  review before I scale the feature further. If you have Next.js full-stack experience or just want to  exchange ideas — feel free to comment or DM 🙌 #WebDevelopment #NextJS #TypeScript #SideProject #CodeReview

Stop digging through DevTools – manage localStorage like a pro 🛠️ If you're a web developer working with frontend apps, you know the struggle: hunting through browser tabs or typing localStorage.getItem() in the console just to debug a simple key-value pair. Enter this Chrome extension – a game changer for working with localStorage. ✅ View, edit, delete, and debug localStorage data instantly ✅ No more console commands or hidden DevTools panels ✅ Clean UI that saves minutes (which add up fast) Whether you're building a React, Vue, or vanilla JS app, this tool removes friction and speeds up your debugging flow. Try it once, and you'll wonder how you lived without it. Source: https://lnkd.in/ePyXn3RP #webdevelopment #javascript #frontend #chromeextension #localstorage #debugging #codingtools #programming #html #ai #developerexperience

JavaScript, the backbone of web development, offers a plethora of libraries catering to diverse needs. As developers, the challenge lies not just in choosing a library but in making an informed decision based on project requirements. In this blog post, you'll dive into several prominent JavaScript libraries, dissecting their features, use cases, and practical considerations. Whether you’re building a quick prototype or a full-blown enterprise app, this post will help you code smarter, not harder. #JavaScript #WebDevelopment #VueJS #ReactJS #Angular #jQuery #FrontendDev #RheinwerkComputingBlog #RheinwerkComputingInfographic Read the full post and tag someone who will find this helpful! https://hubs.la/Q04cKg0n0

This small React mistake can break your entire app 👇 Many developers write code like this: if (condition) return null; useEffect(() => { // logic }, []); Looks fine, right? ❌ But it can cause a serious error. 💥 Error: "Rendered fewer hooks than expected" 🔍 Why this happens React has a strict rule: 👉 Hooks must be called in the same order on every render 📌 What actually happens: • 1st render → early return → useEffect NOT called • 2nd render → useEffect called 👉 Hook order mismatch = 💣 error ✅ Fix Always call hooks first, then apply conditions: useEffect(() => { // logic }, []); if (condition) return null; 💡 Rule to remember: Never call hooks conditionally. Keep them at the top level. Have you ever faced this error before? 👇 #react #nextjs #javascript #webdevelopment #frontend

I think this is a common mistake among beginners. If you're a beginner and want to avoid this, it's better to use ESLint or Biome. I recommend using Biome it's faster, and the default settings are actually pretty good 🤩

Me: Watches 50 tutorials on React Also me: Still can’t build a simple app 😭 Reality check 👇 You don’t learn development by watching. You learn by BUILDING. Here are 3 frontend projects that will actually make you job-ready: 1️⃣ Portfolio Website (HTML, CSS, JS) → Learn fundamentals + design 2️⃣ API-Based App (React + API) → Learn real-world data handling 3️⃣ Fullstack Project (Frontend + Backend) → Understand how everything connects Stop consuming. Start building. Which project are you working on right now? 👇 #frontenddeveloper #webdevelopment #javascript #reactjs #softwareengineering  #buildinpublic #devcommunity #codinglife #learninpublic #programming

Your React app is slow. Here's why. 🐢 Most devs jump straight to optimization tools. But 90% of the time, the fix is simpler: 🔴 Fetching data in every component independently → Lift it up or use a global state solution 🔴 Importing entire libraries for one function → `import _ from 'lodash'` hurts. Use named imports. 🔴 No lazy loading on heavy routes → React.lazy() exists. Use it. 🔴 Images with no defined size → Layout shifts kill perceived performance 🔴 Everything in one giant component → Split it. React re-renders what changed, not what didn't. Performance isn't magic. It's just not making avoidable mistakes. Save this for your next code review. 🔖 #ReactJS #Frontend #WebPerformance #JavaScript #WebDev