Arun Dubey’s Post

🚀 Mini Project of the Day: Password Strength Checker First, I show how it works: • Checks password strength • Animated strength bar • Show / Hide password button Then, you can see the code being written in **30x speed** (HTML + CSS + JS). Goal: to improve my frontend skills and create clean, interactive UI components. #frontend #javascript #webdevelopment #vuejs #coding #juniordeveloper #uiux #learntocode #portfolio

“𝗛𝗼𝘄 𝗱𝗼 𝘆𝗼𝘂 𝗿𝗲𝗱𝘂𝗰𝗲 𝗯𝘂𝗻𝗱𝗹𝗲 𝘀𝗶𝘇𝗲?” One of the most common frontend interview questions — but many people answer it only from a React perspective. 𝗙𝗶𝗿𝘀𝘁, 𝘄𝗵𝘆 𝗱𝗼𝗲𝘀 𝗯𝘂𝗻𝗱𝗹𝗲 𝘀𝗶𝘇𝗲 𝗺𝗮𝘁𝘁𝗲𝗿? When a user opens your app, the browser downloads assets like HTML, CSS, and JavaScript. Out of these, JavaScript is usually the biggest performance bottleneck. A large JS bundle means: • slower initial load • more parsing/execution time • delayed interactivity • poor user experience That’s why reducing bundle size is important. 𝗛𝗼𝘄 𝘁𝗼 𝗿𝗲𝗱𝘂𝗰𝗲 𝗶𝘁? 𝟭. 𝗦𝘁𝗮𝗿𝘁 𝗯𝗲𝗳𝗼𝗿𝗲 𝗥𝗲𝗮𝗰𝘁 A lot of optimization happens at the browser / platform level: • use native image lazy loading • use Intersection Observer to load content only when it enters the viewport • avoid unnecessary API calls on component mount • use JavaScript dynamic imports to load code only when needed 𝟮. 𝗧𝗵𝗲𝗻 𝗰𝗼𝗺𝗲𝘀 𝗥𝗲𝗮𝗰𝘁 – 𝗖𝗼𝗱𝗲 𝗦𝗽𝗹𝗶𝘁𝘁𝗶𝗻𝗴 One of the best ways to reduce bundle size is code splitting — breaking one large bundle into smaller chunks so only the required code loads initially. React.lazy() is built on top of dynamic imports and helps load components only when needed instead of shipping everything in the first bundle. It can be done in 3 ways: • 𝗥𝗼𝘂𝘁𝗲-𝗯𝗮𝘀𝗲𝗱 → load pages only when user visits them • 𝗖𝗼𝗺𝗽𝗼𝗻𝗲𝗻𝘁-𝗯𝗮𝘀𝗲𝗱 → lazy load heavy components like charts, maps, editors, modals • 𝗠𝗼𝗱𝘂𝗹𝗲-𝗯𝗮𝘀𝗲𝗱 → load heavy libraries/modules only when required 𝟰. 𝗗𝗼𝗻’𝘁 𝘀𝘁𝗼𝗽 𝗮𝘁 𝗹𝗮𝘇𝘆 𝗹𝗼𝗮𝗱𝗶𝗻𝗴 Real-world bundle optimization also includes: • removing unused dependencies • importing only what you use • tree shaking • minification • gzip / brotli compression Best way to think about it: Instead of asking: “How do I optimize React?” Ask: “Does the user really need this code on initial load?” That mindset alone can save a lot of bundle size. #frontend #react #javascript #webperformance #webdevelopment #codeSplitting #bundleoptimization #interviewprep

⚛️ 𝗧𝗵𝗲 𝗠𝗮𝗴𝗶𝗰 𝗕𝗲𝗵𝗶𝗻𝗱 𝗥𝗲𝗮𝗰𝘁 𝗨𝗽𝗱𝗮𝘁𝗲𝘀: 𝗗𝗶𝗳𝗳𝗶𝗻𝗴 𝗔𝗹𝗴𝗼𝗿𝗶𝘁𝗵𝗺 + 𝗥𝗲𝗮𝗰𝘁 𝗙𝗶𝗯𝗲𝗿 Most developers use React every day, but few understand what actually happens when a component re-renders. When state or props change, React does not blindly update the entire DOM. Instead, it follows an intelligent process called 𝗥𝗲𝗰𝗼𝗻𝗰𝗶𝗹𝗶𝗮𝘁𝗶𝗼𝗻. Here’s the simplified flow: 1️⃣ 𝗩𝗶𝗿𝘁𝘂𝗮𝗹 𝗗𝗢𝗠 𝗖𝗿𝗲𝗮𝘁𝗶𝗼𝗻 React creates a new Virtual DOM tree representing the updated UI. 2️⃣ 𝗗𝗶𝗳𝗳𝗶𝗻𝗴 𝗣𝗿𝗼𝗰𝗲𝘀𝘀 React compares the new Virtual DOM with the previous one to find what actually changed. 3️⃣ 𝗠𝗶𝗻𝗶𝗺𝗮𝗹 𝗗𝗢𝗠 𝗨𝗽𝗱𝗮𝘁𝗲𝘀 Only the necessary updates are applied to the real DOM. But as applications grew larger, React needed a smarter way to handle updates. This is where 𝗥𝗲𝗮𝗰𝘁 𝗙𝗶𝗯𝗲𝗿 comes in. 𝗥𝗲𝗮𝗰𝘁 𝗙𝗶𝗯𝗲𝗿 (introduced in React 16) redesigned the reconciliation engine. Instead of processing updates all at once, Fiber breaks rendering into small units of work. This allows React to: ✅ Pause rendering work ✅ Prioritize urgent updates (like user input) ✅ Resume rendering later ✅ Keep the UI responsive 𝗜𝗻 𝘀𝗶𝗺𝗽𝗹𝗲 𝘁𝗲𝗿𝗺𝘀: 𝗗𝗶𝗳𝗳𝗶𝗻𝗴 → Finds what changed 𝗙𝗶𝗯𝗲𝗿 → Decides when and how the updates happen React isn’t just a UI library — it’s a carefully engineered rendering system. #ReactJS #JavaScript #FrontendDevelopment #ReactFiber #WebDevelopment #SoftwareEngineering

If you’re preparing for a React interview, there’s one question you can’t escape… “What is Virtual DOM and why is it used?” Let’s break it down simply... Updating the real DOM is expensive. Even a small change can trigger re-rendering of large parts of the UI, which slows things down. So React introduces the Virtual DOM : a lightweight JavaScript representation of the real DOM stored in memory. Here’s how it actually works: → React creates a virtual copy of your UI → When state/props change, it creates a new Virtual DOM → It compares the old and new versions (diffing) → Calculates the minimum number of changes → Updates only those parts in the real DOM (reconciliation) This makes updates much faster and efficient. Key idea: React doesn’t directly update the DOM every time… It first figures out what exactly changed. So instead of repainting the whole screen… It only updates the pixels that matter. That’s why Virtual DOM is used - to make UI updates smart, not heavy. #React #FrontendDevelopment #JavaScript #WebDevelopment #TechInterviews

𝐑𝐞𝐚𝐜𝐭 𝐮𝐬𝐞𝐄𝐟𝐟𝐞𝐜𝐭 𝐈𝐧𝐭𝐞𝐫𝐯𝐢𝐞𝐰 𝐐𝐮𝐞𝐬𝐭𝐢𝐨𝐧 🤔 Many developers use useEffect daily… but fail to answer this. Question: What happens if dependency array is empty in useEffect? Example: useEffect(() => { console.log("Hello"); }, []); Answer 👇 When dependency array is empty [] ➡ useEffect runs only once ➡ It runs after first render ➡ It will NOT run again on state change Why? Because React thinks there are no dependencies to watch. Now tricky part ⚠️ useEffect(() => { console.log(count); }, []); If count changes, this will NOT run again. Because count is not in dependency array. Correct way ✅ useEffect(() => { console.log(count); }, [count]); Tip for React Interviews: Always remember — No dependency → runs every render Empty array → runs once With dependency → runs when value changes More React interview questions coming 🚀 #ReactJS #useEffect #FrontendDeveloper #JavaScript #WebDevelopment #CodingInterview #ReactInterview #NextJS #SoftwareDeveloper

🚀 useEffect vs useLayoutEffect — One Small Difference, Big Impact! As a React developer, I used to think both hooks were almost the same… until I understood when they run 👇 🔹 useEffect Runs after the browser paints the UI 👉 Non-blocking → Better for performance Perfect for: ✅ API calls ✅ Event listeners ✅ Logging 🔹 useLayoutEffect Runs before the browser paints the UI 👉 Blocking → Can affect performance Used for: ✅ DOM measurements ✅ Layout adjustments ✅ Preventing UI flicker ⚡ The Key Difference: Timing 👉 useLayoutEffect runs first 👉 useEffect runs after paint 💡 Golden Rule Always use useEffect unless you specifically need to measure or modify the DOM before it renders. Understanding this small difference can help you avoid performance issues and UI glitches 👀 💬 Have you ever faced flickering issues or layout bugs in React? #ReactJS #FrontendDevelopment #JavaScript #WebDevelopment #ReactHooks #LearningInPublic

Focus is a superpower. 🍅 We all struggle with distractions while working. To help manage this, I built a Pomodoro Timer using Vue 3 and Tailwind CSS. It's more than just a countdown—it's about managing state effectively. What I focused on: ✨ Timer Logic: Handling intervals, pauses, and mode switches (Work → Break) without memory leaks. ✨ State Management: Tracking completed sessions to suggest long breaks after 4 cycles. ✨ UI/UX: Designed a modern dark interface with glassmorphism effects to reduce eye strain during late-night work. 🛠️ Tech Stack: Vue 3 | Tailwind CSS | Vite | JavaScript 🔗 Live Demo: https://lnkd.in/gPtSy7YG 💻 Code: https://lnkd.in/gcPb7ZQX #VueJS #FrontendDevelopment #WebDev #TailwindCSS #Productivity #OpenSource #BuildInPublic #Portfolio #JavaScript

Do you know why we have to use useLayoutEffect rather than useEffect? Most React developers use useEffect for everything — but there's a hidden trap waiting for you. The Analogy Think of moving into a new house: useEffect = You move furniture in, guests see the messy room for a second, THEN you fix it. There's a brief visible flash. useLayoutEffect = You fix everything BEFORE guests walk in. No flicker. No mess. 🔑 Key Differences useEffect — runs after the browser paints. Non-blocking. Best for: API calls, subscriptions, analytics. useLayoutEffect — runs before the browser paints. Synchronous. Best for: measuring DOM elements, preventing visual flicker, repositioning tooltips. The golden rule? Start with useEffect. Only reach for useLayoutEffect when you see a visual flicker or need a DOM measurement before the user sees the screen. For more insightful content checkout below: 🟦 𝑳𝒊𝒏𝒌𝒆𝒅𝑰𝒏 - https://lnkd.in/dwi3tV83 ⬛ 𝑮𝒊𝒕𝑯𝒖𝒃 - https://lnkd.in/dkW958Tj 🟥 𝒀𝒐𝒖𝑻𝒖𝒃𝒆 - https://lnkd.in/dDig2j75 or Priya Frontend Vlogz 🔷 𝐓𝐰𝐢𝐭𝐭𝐞𝐫 - https://lnkd.in/dyfEuJNt   #frontend #javascript #react #reactjs #html #css #typescript #es6 #interviewquestions #interview #interviewpreparation

𝗗𝗮𝘆 𝟱 𝗼𝗳 𝗺𝘆 𝗥𝗲𝗮𝗰𝘁 𝗡𝗮𝘁𝗶𝘃𝗲 𝗷𝗼𝘂𝗿𝗻𝗲𝘆 🚀 𝗗𝗶𝘃𝗶𝗻𝗴 𝗶𝗻𝘁𝗼 𝗥𝗲𝗮𝗰𝘁 𝗡𝗮𝘁𝗶𝘃𝗲’𝘀 𝗼𝗻𝗟𝗮𝘆𝗼𝘂𝘁 𝗘𝘃𝗲𝗻𝘁 Today I explores how React Native measures layout using the onLayout prop. Here’s what I discovered: When it runs: It’s not just a one-time thing. onLayout fires after the component first mounts and whenever the element’s dimensions (x, y, width, height) change. What triggers it: Changes to the content (like updating text), style updates (padding, margins), or even shifts in a parent layout can all trigger the callback. A key detail: onLayout only fires if the calculated layout actually changes. So if your state updates but the layout on the screen stays the same, the callback won’t run. Learning these nuances really helps when building responsive layouts in React Native! #ReactNative #CodingJourney #Day7 #MobileDev #JavaScript #Expo #LearningToCode

🚀 Built an Image Carousel using JavaScript! Today I worked on a small but important frontend project — an Image Carousel (Image Slider) using HTML, CSS, and JavaScript. 🔹 Key features implemented: • Display images dynamically from an array • Navigate images using Next and Previous buttons • Circular navigation (last image goes back to first) • DOM manipulation using JavaScript • Event handling with addEventListener() 💡 Concepts I practiced: • JavaScript arrays and indexing • DOM selection and manipulation • Event listeners • Writing clean and modular functions This project helped me better understand how interactive UI components work in real web applications. Every small project is a step closer to becoming a better Frontend / Full Stack Developer. 💻 #JavaScript #WebDevelopment #FrontendDevelopment #CodingJourney #100DaysOfCode #LearningInPublic