Amritpal Singh’s Post

Everyone wants to learn the latest framework. But here’s the truth: Frameworks change. Fundamentals don’t. You can learn React in weeks. You can build apps with Next.js quickly. But if you don’t deeply understand JavaScript: Closures Event loop Async behavior Prototypes Execution context You’ll struggle when the app scales. Modern frontend is not about “making it work.” It’s about: • Why did this re-render happen? • Why is this component slow? • Why is memory increasing? • Why is hydration failing? Those answers don’t come from React. They come from JavaScript. AI can generate components. But it cannot debug your mental model. That’s why I’m focusing on strengthening core JavaScript while building real-world projects. Because strong foundations make you framework-independent. And framework-independent developers survive every market shift. #JavaScript #FrontendDevelopment #ReactJS #NextJS #WebDevelopment #LearningInPublic

React keeps evolving, but my brain doesn’t refresh as fast as the docs—so I built a compact React A–Z cheat sheet I can rely on instead of my memory. This is a high‑density desk reference for working React devs: JSX and rendering basics, state management (from useState/useReducer/Context to Redux Toolkit and Zustand), modern hooks, React 19 features, data fetching, forms, styling, testing, and architecture—condensed into a few focused pages. Instead of juggling 20 documentation tabs, you can keep this one sheet open next to your editor, quickly find the concept or keyword you need, and get back to shipping features faster. It’s not a tutorial, it’s a quick “React control panel” for people who already build apps and just want to move faster with fewer interruptions. #ReactJS #React19 #JavaScript #Frontend #WebDevelopment #MERNStack #ReactHooks #ReduxToolkit #TypeScript #NextJS #Remix #ReactNative #Programming #CheatSheet #SoftwareEngineering

Is React 19 finally going to kill useEffect for data fetching? 🤔⚛️ As a React developer, I've written the standard useEffect + fetch boilerplate more times than I can count. But looking at the new use() hook in React 19, things are about to get a lot cleaner. Take a look at the comparison below. 👇 Before: Managing state, loading flags, and dependency arrays. After: Simply passing the promise into use() and letting React handle the suspension. This means: ✅ Less boilerplate code ✅ No more missing dependency warnings ✅ Cleaner, more readable components I am definitely looking forward to refactoring some of my older projects to try this out. What do you guys think? Are you adopting the use() hook immediately, or sticking to libraries like React Query? Let me know! 👇 #reactjs #react19 #javascript #frontenddevelopment #webdev #coding #cleancode #webdevelopment #learning #codinglife

React Rerenders: The Invisible Performance Killer I have been going deep into how and why React components rerender not just using React, but understanding it properly. Here is what I have been focusing on When rerenders occur: State changes Props changes Parent rerenders Context updates and Common mistakes that cause unnecessary rerenders Inline functions and objects Poor state placement Unoptimized API calls Overusing Context How I handle multiple rerenders useMemo and useCallback Splitting components correctly Lifting state only when required Memoizing heavy components with React.memo Handling APIs efficiently Preventing duplicate API calls Handling rapid search queries Canceling requests Debouncing and throttling Managing loading and partial data states I am not chasing frameworks blindly. I am strengthening fundamentals, because strong foundations scale. Every optimization I learn today saves hours of debugging tomorrow. Still learning. Still building. Still consistent. #ReactJS #FrontendDevelopment #WebPerformance #LearningInPublic #JavaScript #Consistency

JavaScript: Loved. Hated. Still Running the World. “This is my favorite language.” 👉🏻 points at JavaScript Then reality appears: "11" + 1 = "111" "11" - 1 = 10 Welcome to type coercion. Confusing at first. Powerful once you understand it. And somehow… always part of the debate. This is why JavaScript sparks endless arguments: • It’s incredibly flexible • It can feel unpredictable • And it’s absolutely everywhere From React, Angular, and Vue.js on the frontend… To Node.js on the backend… To mobile and desktop apps… JavaScript isn’t just a language anymore. It’s an ecosystem. But here’s the real takeaway 👇🏻 The lesson isn’t: “JavaScript is bad.” The lesson is: Every language has quirks. Strong developers don’t complain about them. They learn how they work and write better code because of it. What actually makes you professional? • Understanding why behavior happens • Writing clean, predictable logic • Knowing when a language is the right tool and when it’s not • Mastering fundamentals: types, scope, execution context Memes make us laugh. Understanding makes us better engineers. JavaScript doesn’t make developers weak. Not understanding it does. What’s the most confusing JavaScript behavior you’ve faced? RRK signing off! #FullStackDeveloper #WebDevelopment #JavaScript #BuildInPublic #LearningInPublic #CareerGrowth

React performance issues often start with one simple mistake: Using React.memo, useMemo, and useCallback without knowing the difference. They all sound similar, but they solve different performance problems. Here’s the simple breakdown 👇 ⚛️ React.memo – Memoizes a component If the props don’t change, React skips re-rendering the component. 👉 Best when a component re-renders often but receives the same props most of the time. 🧠 useMemo – Memoizes a computed value It stores the result of an expensive calculation and only recomputes it when dependencies change. 👉 Useful for things like filtering, sorting, or heavy calculations. 🔁 useCallback – Memoizes a function Prevents a function from being recreated on every render. 👉 Especially helpful when passing callbacks to memoized child components. But here’s the important part 👇 🔹 React.memo → Optimizes component re-renders 🔹 useMemo → Optimizes expensive calculations 🔹 useCallback → Optimizes function references 💡 Adding them everywhere doesn’t automatically improve performance. In fact, unnecessary memoization can make your app slower and harder to maintain. The real skill is knowing when optimization is actually needed. If you're learning React, understanding these three tools can make debugging re-renders and performance issues much easier. 💬 Quick question: Which one confused you the most when you first learned React — useMemo or useCallback? #React #JavaScript #WebDevelopment #FrontendDevelopment #ReactJS #CodingJourney

💡𝗡𝗼𝗱𝗲.𝗝𝗦 𝗳𝗼𝗿 𝗕𝗲𝗴𝗶𝗻𝗻𝗲𝗿𝘀: 𝗪𝗵𝘆 𝗬𝗼𝘂 𝗦𝗵𝗼𝘂𝗹𝗱 𝗚𝗶𝘃𝗲 𝗜𝘁 𝗮 𝗦𝗵𝗼𝘁 So you know JavaScript on the frontend… but what about the backend? That’s where 𝗡𝗼𝗱𝗲.𝗝𝗦 comes in! 𝗪𝗵𝘆 𝗶𝘁’𝘀 𝗮𝘄𝗲𝘀𝗼𝗺𝗲: 𝗦𝗮𝗺𝗲 𝗹𝗮𝗻𝗴𝘂𝗮𝗴𝗲 𝗲𝘃𝗲𝗿𝘆𝘄𝗵𝗲𝗿𝗲: No need to learn another backend language—your JS skills follow you. 𝗦𝘂𝗽𝗲𝗿 𝗳𝗮𝘀𝘁: Built on Chrome’s V8 engine, handling tons of requests simultaneously. 𝗛𝘂𝗴𝗲 𝗰𝗼𝗺𝗺𝘂𝗻𝗶𝘁𝘆: Thousands of packages on 𝗻𝗽𝗺 to make your life easier. 𝗥𝗲𝗮𝗹-𝘁𝗶𝗺𝗲 𝗺𝗮𝗴𝗶𝗰: Perfect for chats, games, or live-updating apps. 𝗧𝗶𝗽𝘀 𝘁𝗼 𝗴𝗲𝘁 𝘀𝘁𝗮𝗿𝘁𝗲𝗱: 1️⃣ Spin up a simple server with the http module. 2️⃣ Explore 𝗘𝘅𝗽𝗿𝗲𝘀𝘀.𝗷𝘀—building APIs is a breeze. 3️⃣ Build small projects like a 𝗧𝗼-𝗗𝗼 𝗮𝗽𝗽 or mini chat. 4️⃣ Play around with 𝗮𝘀𝘆𝗻𝗰/𝗮𝘄𝗮𝗶𝘁—it’s easier than it looks! Start small, experiment, and have fun. 𝗡𝗼𝗱𝗲.𝗝𝗦 is versatile, beginner-friendly, and in-demand—perfect for your next project. #NodeJS #JavaScript #BackendDevelopment #CodingForBeginners #WebDev

JavaScript Temporal is finally here—but don’t delete your polyfills yet! 🚦 The 30-year "Date object" nightmare is officially ending. With Chrome 144 shipping native support last month, we’ve hit a massive milestone for JavaScript. But before you refactor your entire codebase, here is the 2026 reality check: The Current Status (Feb 2026): ✅ Chrome 144+: Native support is live and stable. ✅ Firefox 139+: Native support has been available since last year. ⚠️ Safari: Still in Technical Preview (no stable release date yet). ⚠️ Node.js: Remains behind the --experimental-temporal flag. ⚠️ TC39: Currently at Stage 3. The goal is Stage 4 (final standardization) for the ES2026 spec later this year. Why the hype is real: Immutability: Temporal objects cannot be changed. No more bugs where a helper function accidentally mutates your React state. First-Class Timezones: Temporal.ZonedDateTime handles IANA timezones natively. Say goodbye to 20kB libraries just to show a user’s local time. No more "Month 0": January is finally 1. We can all stop writing month + 1 in our headers. The 2026 Strategy: If you are building for Chrome/Firefox internal tools, go native. If you are shipping to the public web, use a polyfill (like @js-temporal/polyfill). You get the clean, modern API today while staying safe for Safari users. Bottom Line: We are in the "Transition Year." 2026 is when we learn the new API; 2027 is when we finally delete the libraries. Are you starting to use Temporal in your new projects, or are you waiting for Safari to catch up? 👇 #JavaScript #TemporalAPI #WebDev #SoftwareEngineering #Coding #Frontend #TechTrends2026

🚀 React Performance Hooks: useMemo vs useCallback Ever stared at your React code wondering which hook to reach for? Here's the breakdown every developer needs: useMemo 💾 → Memoizes a value → Caches expensive computations → Returns: a value useCallback 🔗 → Memoizes a function → Caches function references → Returns: a callback function The Golden Rule: Computing something heavy? → useMemo Passing functions to child components? → useCallback Both use dependency arrays [a, b] to know when to recalculate. Skip them and you're just adding overhead without the optimization! Pro tip: Don't over-optimize! React is fast. Profile first, then memoize. 🎯 What's your go-to rule for choosing between these two? Drop it in the comments! 👇 #ReactJS #WebDevelopment #JavaScript #Frontend #CodingTips #SoftwareEngineering #TechTips #LearnToCode

JavaScript events like scroll, resize, and typing can fire hundreds of times per second. If we run heavy functions on every event, the app can become slow and inefficient. Two common solutions to control this are: Debounce and Throttle Debounce Runs the function only after the event stops firing for a specific time. Example: Search input autocomplete. Throttle Runs the function at most once in a fixed time interval, even if the event keeps firing. Example: Scroll event handling. Quick difference: Debounce → waits for user inactivity Throttle → limits how often a function can run Using these techniques improves performance, user experience, and efficiency in real-world applications. Follow for more JavaScript concepts explained visually. 🚀 #javascript #webdevelopment #frontenddeveloper #coding #softwareengineering