WebAssembly for web apps: beyond syntax and systems thinking

Unpopular opinion: most WebAssembly for compute-heavy web apps — real-world use cases tutorials are teaching you the wrong thing. They teach syntax. They should teach systems thinking. The difference between a junior and senior developer isn't knowing more APIs. It's knowing which problems are worth solving and which to delegate — to a teammate, a library, or an AI. What's the most valuable lesson you've learned that no tutorial ever taught you? #WebDevelopment #TypeScript #Frontend #JavaScript

𝐈 𝐥𝐞𝐟𝐭 𝐚 𝐛𝐥𝐚𝐧𝐤 𝐢𝐧𝐩𝐮𝐭 𝐟𝐢𝐞𝐥𝐝 𝐚𝐧𝐝 𝐦𝐲 𝐞𝐧𝐭𝐢𝐫𝐞 𝐚𝐩𝐩 𝐨𝐮𝐭𝐩𝐮𝐭 "𝐮𝐧𝐝𝐞𝐟𝐢𝐧𝐞𝐝." One bug. Five minutes of debugging. More clarity than weeks of watching tutorials. Day 2 of building OutreachBuilder — a real SaaS tool, in pure Vanilla JavaScript. Here's what I built today: → 𝐀 𝐃𝐎𝐌 𝐛𝐫𝐢𝐝𝐠𝐞 𝐮𝐬𝐢𝐧𝐠 𝐠𝐞𝐭𝐄𝐥𝐞𝐦𝐞𝐧𝐭𝐁𝐲𝐈𝐝() — 𝐪𝐮𝐞𝐫𝐢𝐞𝐝 𝐨𝐧𝐜𝐞, 𝐮𝐬𝐞𝐝 𝐞𝐯𝐞𝐫𝐲𝐰𝐡𝐞𝐫𝐞 → 𝐃𝐞𝐟𝐞𝐧𝐬𝐢𝐯𝐞 𝐢𝐧𝐩𝐮𝐭 𝐡𝐚𝐧𝐝𝐥𝐢𝐧𝐠 𝐰𝐢𝐭𝐡 .𝐭𝐫𝐢𝐦() 𝐚𝐧𝐝 𝐎𝐑 𝐟𝐚𝐥𝐥𝐛𝐚𝐜𝐤 𝐭𝐨 𝐩𝐫𝐞𝐯𝐞𝐧𝐭 𝐮𝐧𝐝𝐞𝐟𝐢𝐧𝐞𝐝 𝐞𝐫𝐫𝐨𝐫𝐬 → 𝐀 𝐬𝐰𝐢𝐭𝐜𝐡 𝐬𝐭𝐚𝐭𝐞𝐦𝐞𝐧𝐭 𝐫𝐨𝐮𝐭𝐢𝐧𝐠 𝐞𝐧𝐠𝐢𝐧𝐞 𝐰𝐢𝐭𝐡 𝐄𝐒6 𝐭𝐞𝐦𝐩𝐥𝐚𝐭𝐞 𝐥𝐢𝐭𝐞𝐫𝐚𝐥𝐬 → 𝐀𝐬𝐲𝐧𝐜 𝐂𝐥𝐢𝐩𝐛𝐨𝐚𝐫𝐝 𝐀𝐏𝐈 𝐰𝐢𝐭𝐡 𝐚 𝐭𝐫𝐲/𝐜𝐚𝐭𝐜𝐡 𝐚𝐧𝐝 𝐚 𝐬𝐞𝐭𝐓𝐢𝐦𝐞𝐨𝐮𝐭 𝐯𝐢𝐬𝐮𝐚𝐥 𝐟𝐞𝐞𝐝𝐛𝐚𝐜𝐤 𝐥𝐨𝐨𝐩 No React. No libraries. Just clean, intentional JavaScript. The kind of JS knowledge that actually makes you dangerous as a developer — because you understand what every framework is doing for you. Day 3 is localStorage. Follow along if you're building too. #BuildingInPublic #JavaScript #WebDevelopment #CodeDaily #Developers #CodingJourney #TechCommunity

⚛️ Common React Mistakes That Are Killing Your Performance 💀 You think your React code is fine… . But these small mistakes are silently breaking your app 👀 Here’s what most developers still do wrong 👇 . ❌ Mutating state directly React won’t re-render properly (page 2)  ❌ Using index as key Leads to weird UI bugs when list updates (page 3)  ❌ Too much global state Unnecessary re-renders & messy logic (page 4)  ❌ useEffect misuse Missing dependency array = infinite loop 🔁 (page 5)  ❌ Storing derived state You’re duplicating logic for no reason (page 6)  ❌ Too many re-renders New objects/functions every render = performance drop (page 7)  ❌ Ignoring loading & error states Your UI breaks when API fails (page 8)  ❌ Poor folder structure Good code needs good organization (page 9)  . 🔥 React isn’t hard… Bad practices make it hard 💬 Clean code = scalable apps 📌 Save this before your next project . More Details Visit: https://lnkd.in/gRVwXCtq Call: 9985396677 | info@ashokit.in. . #ReactJS #Frontend #WebDevelopment #JavaScript #Coding #Developers #Programming #SoftwareEngineering

Most JavaScript bugs aren’t “big” bugs. They’re small ones hiding in places like this: Trying to read a nested property that doesn’t exist. And suddenly: Cannot read properties of undefined One tiny operator that saves a lot of headaches: Optional chaining (?.) Instead of writing: user.company.address.city Write: user.company?.address?.city If something is missing, your app doesn’t crash. It just returns undefined. Small JS tip. Big difference in real projects. Do you use ?. everywhere already or still catch yourself forgetting it sometimes? #JavaScript #Frontend #WebDevelopment #SoftwareEngineering #CodingTips #ReactJS #TypeScript #Developers #AITechDaily

I used to think performance optimization is for advanced developers… So I ignored it. Focused only on building features. But during one project, I noticed: Slow loading Unnecessary re-renders Heavy components That’s when it clicked. 👉 Performance is not optional anymore Now I focus on: • Smaller components • Optimized rendering • Clean logic The biggest learning: A fast app is always better than a complex one. What do you prioritize more: Features or performance? #ReactJS #WebPerformance #FrontendDeveloper #JavaScript

🚀 Small Bug, Big Lesson in Full-Stack Development I recently worked on improving a web app by making the user experience smoother — instead of typing long zone names manually, users can now simply search or select from a dropdown list. But during this update, everything broke. The frontend stopped communicating properly with the backend, and the entire feature failed. After digging through the code, checking API responses, and debugging step-by-step, I finally found the issue… A simple variable mismatch: “zone” vs “zones” That tiny inconsistency was enough to break the connection between the frontend and backend API. 🔍 What I learned: - Consistency in naming is critical in full-stack development - Debugging is not about guessing, but tracing data flow carefully - Small changes can introduce unexpected system-wide issues 💡 Fixing this not only restored functionality but also reinforced how important attention to detail is when working across client and server. You can check out the project here: 👉 [https://lnkd.in/dCuCfCsv] #WebDevelopment #JavaScript #NodeJS #FullStackDeveloper #Debugging #SoftwareEngineering #LearningInPublic #Frontend #Backend #CodingJourney

26 questions. The difference between knowing React on paper and surviving a real production codebase. Here are the 26 questions categorized by the depth of experience required: Level 1: The Foundations => How does React’s rendering process work? => What’s the difference between state and props? => What are hooks, and why were they introduced? => What are controlled vs uncontrolled components? => When would you use refs? => How do you handle forms and validations? Level 2: State & Logic => When should you lift state up? => How do you manage complex state in an application? => When would you use useState vs useReducer? => How do useEffect dependencies work? => How do you handle API calls (loading, error, success states)? => How do you manage shared state across components? => Context API vs Redux — when would you use each? Level 3: Performance & Scale => What causes unnecessary re-renders, and how do you prevent them? => What is memoization in React? => When would you use React.memo, useMemo, and useCallback? => How do you structure a scalable React application? => How do you optimize performance in large-scale apps? => What tools do you use to debug performance issues? => How do you secure a React application? => How do you test React components effectively? Level 4: The War Stories => Have you faced an infinite re-render issue? How did you fix it? => Tell me about a complex UI you built recently. => How did you improve performance in a React app? => What’s the hardest bug you’ve fixed in React? => How do you handle 50+ inputs in a single form without lag? Syntax is easy to Google. Deep understanding is hard to fake. #ReactJS #FrontendDevelopment #TechInterviews #JavaScript #WebDevelopment #Developers

I just started a deep dive into React and came across how it uses snapshots to re-render the view, by strictly comparing references of the old state copy in memory to the newer one. That immediately triggered a question: When we do so many state updates in a large production app, we are essentially creating so many snapshots in memory that will most likely never be used again. What happens to all this garbage sitting in memory? There must be massive leaks everywhere, right? Short answer: No. Long answer: Here's why. Every state update creates a new snapshot in memory. The old one loses all references pointing to it. JavaScript's Garbage Collector sees this and frees it automatically. GC's only rule → if nothing points to it, it's gone. 🧹 Real leaks in React come from YOU accidentally holding references outside React's control: ❌ Pushing state into an array that lives outside the component ❌ Adding event listeners without removing them ❌ setInterval running after the component unmounts In all these cases GC sees "something still points here" and leaves it alone, forever. useEffect cleanup exists for exactly this reason: return () => window.removeEventListener("resize", handler); One line. Prevents an entire class of memory leaks. React is not the problem. Uncleaned side effects are. #React #JavaScript #Frontend #SoftwareEngineering #WebDev

I struggled with this React concept more than I expected… 👇 👉 Why are my API calls running twice? ⚙️ What you’ll notice You open your network tab and suddenly see this: api/me → called twice api/roles → called twice api/permissions → called twice Just like in the screenshot 👇 Same request, duplicated… again and again. ⚙️ What’s actually happening In React (development mode), if your app is wrapped in Strict Mode, React will run effects twice on purpose. useEffect(() => { fetch("/api/users") .then(res => res.json()) .then(setUsers); }, []); Even though it looks like it should run once… it doesn’t (in dev). 🧠 What’s going on under the hood React basically does a quick cycle: mount → unmount → remount Why? To catch hidden side effects To check if cleanup is handled properly To make sure your logic doesn’t break on re-renders So if your API call runs twice, React is just making sure your code can handle it. 💡 The important part This only happens in development Production behaves normally (runs once) Your side effects should be safe to run multiple times 🚀 Final thought If your network tab looks “noisy” like the screenshot, it’s not React being broken — it’s React being careful. And once you understand this, debugging becomes a lot less confusing. #React #Frontend #JavaScript #WebDevelopment #ReactJS #SoftwareEngineering

🚀 Strengthening my React fundamentals! Here are 10 core concepts every React developer should know (and actually understand 👇) 1️⃣ React is a declarative, component-based library for building UIs 2️⃣ UI updates when state or props change 3️⃣ State = mutable data inside a component 4️⃣ Props = read-only data from parent to child 5️⃣ "useEffect" handles side effects (API calls, timers) 6️⃣ Virtual DOM improves performance 7️⃣ Keys help React track list updates efficiently 8️⃣ Controlled components = form inputs managed by state 9️⃣ Lifting state up helps share data between components 🔟 Custom hooks allow reusable logic 💡 Learning React is not about memorizing—it’s about understanding how UI reacts to data. #ReactJS #FrontendDevelopment #WebDevelopment #LearningInPublic #JavaScript