useEffect vs useLayoutEffect in React

Junior me: "Why is my React component randomly resetting?" Senior me: "Did you touch the DOM directly?" Junior me: "...maybe" Here's the lesson that took me longer than I'd like to admit: React owns the DOM. You don't. When you do this 👇 document.querySelector('.box').style.display = 'none'; React has no idea. On the next re-render, it overwrites you. Silently. Mercilessly. The right way? ✅ Use useEffect to run side effects after render ✅ Use useRef for safe, controlled DOM access ✅ Use state to drive UI changes — not DOM calls useEffect(() => {  inputRef.current.focus(); }, []); This is React-aware. It survives re-renders. It cleans up after itself. The mental shift that changes everything: You're not telling the DOM what to do. You're telling React what the UI should look like. React does the rest. Took me a while to get this. Hope it saves you some debugging hours. 🙌 #React #useEffect #JavaScript #FrontendDevelopment #WebDev #ReactJS #Programming #DeveloperLife #TechTips #CodeNewbie

🔥 Is CSS replacing JavaScript? 👀 Modern CSS is becoming more powerful than ever… We can now do things that once required JavaScript 👇 • Conditional logic with if() • Scroll-based animations (no JS needed) • Scoped styling with @scope • Cleaner layouts with anchor positioning This means: Less JavaScript Cleaner code Better performance 🚀 Frontend development is evolving fast. Are we moving towards a “CSS-first” approach? 🤔 What do you think? #CSS #JavaScript #FrontendDeveloper #WebDevelopment #Programming

A lot of UI behaviors and interactions that used to require JavaScript can now be handled natively with modern CSS. Small capabilities like tooltips, smooth scrolling, responsive layouts, selection control, and even some visual depth effects are now much easier to build with less complexity in the frontend. It is a good reminder that modern CSS has evolved far beyond styling alone and can often simplify implementation while keeping the experience polished. I used Codex to turn this idea into a visual, and it was interesting to compare it with my usual Claude Code + Remotion workflow. #csshtmljs #webdev #frontend #programming #uidesign

most React developers don't know why their form inputs lose values when the list reorders. they blame the form. they blame React. they don't blame the keys. the real problem: - keys tell React which item is which - without stable keys, React loses component state - reordering breaks everything silently what happens: - form input values disappear - component state attaches to wrong items - animations glitch - bugs are invisible until production #reactjs #typescript #webdevelopment #buildinpublic #javascript

#WebDevlopmentBootcamp #Day_93 React.js • Tailwind CSS • DaisyUI • JavaScript (ES6+) • React Toastify ✨ Highlights: • Dynamic product listing & cart system • Add/remove functionality with real-time updates • Toast notifications for better user experience • Clean UI based on Figma design • Fully responsive across all devices This project strengthened my skills in React state management, component-based architecture, and responsive UI design. Live link: https://lnkd.in/gV44NTiQ Programming Hero #WebDevelopment #CodingBootcamp #HTML #CSS #javaScript #NextJs #tailwindCss #React #Git #GitHub #LearningInPublic #BuildInPublic #SoftwareEngineering #TechJourney #JuniorDeveloper

🎮 Built a Simon Says Game using HTML, CSS & JavaScript I recently built a memory-based game where users have to repeat an increasing sequence of colors. I created this project while learning from #ApnaCollege, and it helped me strengthen my JavaScript fundamentals. 🔧 Key Features: • Interactive UI with color-based buttons • Keyboard event to start the game • Level progression system • Game-over and restart functionality 💡 What I learned: • DOM manipulation and event handling • Writing game logic step-by-step • Improving UI using HTML & CSS 🔗 Live Demo: https://lnkd.in/gJKbbDHq I would love to hear your feedback and suggestions to improve this further. #WebDevelopment #JavaScript #Frontend #Projects #LearningJourney #100DaysOfCode

Understanding the DOM is where real frontend mastery begins. If you can navigate and manipulate the DOM confidently, you’re already ahead of most developers. Window —> Document —> HTML * The window is your global entry point * The document represents the webpage * Everything inside HTML is structured as a tree of nodes Selecting Elements : * getElementById() :- Target specific elements * querySelector() :- CSS-style selection * querySelectorAll() :- Returns a NodeList (supports `forEach`) * getElementsByClassName() :- Returns an HTMLCollection DOM Traversal: * Move through elements using: `parentElement`, `children`, `firstElementChild`, `nextElementSibling` Reading Content: * `innerText` :— Visible text only * `textContent` :— All text (including hidden) * `innerHTML` :— Full HTML structure Key Insight: Everything in the DOM is a node—once you understand that, manipulation becomes much easier. #JavaScript #WebDevelopment #Frontend #DOM #Programming #Coding #WebDevTips #Software #FullStackdeveloper #Backendevelopment #codeTips #tips #js #node #expressjs #UK #Careers

Understanding the Virtual DOM in JavaScript The Virtual DOM is one of the core concepts behind modern frontend frameworks like React. Instead of directly manipulating the real DOM, which can be slow and inefficient, frameworks use a virtual representation of the DOM in memory. This allows them to calculate the most efficient way to update the UI. When changes occur in the application state, the Virtual DOM creates a new representation and compares it with the previous version. This process, known as reconciliation, identifies the minimal set of changes needed to update the real DOM. As a result, applications become faster and more efficient. Understanding how the Virtual DOM works helps developers write better frontend code. It encourages practices such as minimizing unnecessary re-renders and structuring components efficiently. By leveraging the Virtual DOM, developers can build highly responsive and performant user interfaces. Question for discussion: Do you think the Virtual DOM still gives a big advantage in modern frameworks? #JavaScript #FrontendDevelopment #ReactJS #WebDevelopment #Programming

🚀 Just built a cool JavaScript mini-project! Today I worked on a simple but fun concept using DOM manipulation & mouse events 🎯 👉 Created a circle that follows the cursor in real-time 👉 Used event.clientX and event.clientY to track movement 👉 Applied dynamic styling with position: absolute 💡 This small project helped me understand: How browser events work Real-time UI interaction Importance of CSS positioning in JavaScript Sometimes, small projects teach BIG concepts 🔥 Excited to build more interactive UI experiences! #JavaScript #WebDevelopment #Frontend #Coding #Learning #DOM #BeginnerProjects

Unpopular opinion: If you're manually manipulating the DOM in React, you're not writing React. I see this more than I should: document.getElementById('box').style.color = 'red'; It works. Until it doesn't. On the next render, React overwrites your change. Now you have a bug you can't explain. And a 2am debugging session you didn't plan for. Here's what React actually wants you to do: → Describe WHAT the UI should look like → Let React figure out HOW to get there → Use useEffect when you need to step outside the render cycle → Use useRef when you genuinely need a DOM reference The moment you bypass React's virtual DOM, you're fighting the framework. And the framework always wins. useEffect isn't just a hook. It's React saying: "Trust me. I'll handle it after the render." Stop poking the DOM. Start thinking in React. #React #JavaScript #FrontendDevelopment #WebDev #SoftwareEngineering #Programming #ReactJS #DeveloperLife #CodeQuality #BuildInPublic #sde #SDE #DSA