React Component Hoisting: Understanding JavaScript Rules

One of the most common confusions I see in React is between state and props 🤔 I struggled with this too — until I worked on real projects. Here’s how I understand it now 👇 Props are read-only. They are used to pass data from a parent component to a child. State is mutable. It belongs to the component and controls how it behaves and re-renders. A simple way to think about it: • Props = input to a component 📥 • State = internal memory of a component 🧠 If a component needs to change data → use state. If it only needs to display data → use props. Understanding this early makes your React code cleaner, predictable, and easier to debug. Simple concepts, when used correctly, make a big difference in real applications 🚀 #ReactJS #JavaScript #WebDevelopment #FrontendDevelopment #MERNStack

DAY 4 | WHY DOES REACT BREAK THE UI INTO COMPONENTS? 🧩 Earlier, the whole page was written as one big block. One small change → risk of breaking something else. React changed this idea. React says: 👉 break the UI into small, independent pieces. Each piece: 🔹 has its own logic 🔹 handles its own UI 🔹 doesn’t disturb others So instead of fixing a whole page, you fix only the part that matters. That’s why React apps are built with components, not pages. #ReactJS #FrontendDevelopment #WebDevelopment #JavaScript #LearnInPublic #CodingJourney #SoftwareEngineering

⚛️ React Hooks.. Hooks make React functional components powerful, reusable, and easy to manage. Here’s a quick list of the most important ones: Basic Hooks: useState – manage state useEffect – handle side effects useContext – access global state Additional Hooks: useReducer – complex state logic useCallback – memoize functions useMemo – memoize values useRef – access DOM & persist values useImperativeHandle – expose methods from child useLayoutEffect – run effects before browser paints useDebugValue – debug custom hooks Combine these hooks to write clean, reusable, and high-performance React code. #ReactJS #WebDevelopment #FrontendDeveloper #CodingTips #Hooks #JavaScript Mentor: Miss Sheikh Hafsa Nadeem

One thing Next.js really taught me as a developer 👇 "Performance isn’t something you “fix later” — it’s something you design for." Working with Next.js forces you to think about: * Which pages should be static, server-rendered, or dynamic * Fetching data on the server vs client * Reducing unnecessary JavaScript with Server Components * Improving load times without extra libraries These decisions don’t just make apps faster — they make them feel more professional and production-ready. React helps you build UI. Next.js helps you build performant products. Still learning..., still optimizing... 👉 Curious to know: what Next.js feature helped you improve performance the most? #NextJS #Performance #ReactJS #FrontendDevelopment #WebPerformance #JavaScript #LearningInPublic

🚀 Mastering the DOM in JavaScript! Here’s a quick cheat sheet I use to recall essential DOM methods and events while building dynamic web apps using React (and the entire MERN stack) 💻 Understanding the DOM is the backbone of frontend development whether it’s handling user interactions, updating UI efficiently, or manipulating elements directly when needed. 📘 Key DOM Concepts Covered: Selecting elements dynamically Creating & modifying nodes Handling events (Mouse, Keyboard, Form) 💡 DOM mastery = Smoother React logic + Better debugging + Cleaner component rendering #JavaScript #MERNStack #FrontendDevelopment #WebDevelopment #ReactJS #DeveloperLearning #CodingCheatSheet #TechCareer

Re-render misconception Most devs think: React re-renders = React re-paints the whole DOM. Not true - React re-renders components - then compares Virtual DOM - updates only what changed in real DOM So re-render ≠ performance problem. Performance problem happens when: heavy computations run on each render unnecessary re-renders trigger expensive children Fix: useMemo, useCallback, React.memo split components properly Question: what was the biggest re-render performance issue you faced in React? #reactjs #javascript #frontend #webdevelopment #performance

🦕 Remember componentDidMount? If you started React recently, you might not. React has evolved significantly. We moved from the explicit lifecycle methods of Class Components to the sleek synchronization engine of Functional Components and Hooks. But understanding the Lifecycle is still crucial to mastering useEffect. The Three Phases of a Component: 1️⃣ Mounting (Birth): The component is created and inserted into the DOM. - Old: componentDidMount - New: useEffect(() => { ... }, []) (Empty dependency array) 2️⃣ Updating (Growth): The component re-renders because props or state changed. - Old: componentDidUpdate - New: useEffect(() => { ... }, [prop, state]) (Array with dependencies) 3️⃣ Unmounting (Death): The component is removed from the DOM. - Old: componentWillUnmount - New: useEffect(() => { return () => { ... } }, []) (The cleanup function) The Mental Shift: Instead of thinking "When does this run?" (Time-based), try thinking "What is this synchronized with?" (State-based). Which syntax do you find easier to reason about? #ReactJS #WebDevelopment #Frontend #JavaScript #CodingTips #Hooks

🚀 Debouncing in JavaScript — Small Concept, Big Performance Boost Today I learned about Debouncing, a powerful technique used to control function execution. 🔹 What is Debouncing? Debouncing ensures a function runs only after a certain delay, once the user stops triggering an event. In simple words: 👉 “Wait first, then execute.” 🔹 Why is Debouncing helpful? ✅ Improves performance ✅ Reduces unnecessary function calls ✅ Prevents API overloading ✅ Makes apps smoother & faster 🔹 Where is Debouncing used? 📌 Search input fields 📌 Button clicks 📌 Window resize events 📌 Scroll-based actions 📌 API calls on user input ✨Debouncing is widely used in React, frontend apps, and real-world production code. Learning such performance-focused concepts is helping me write better and smarter code every day. 👉 Have you used debouncing in any project yet? #JavaScript #WebDevelopment #FrontendDevelopment #PerformanceOptimization #LearningInPublic #CodingJourney #ReactJS #MERN

🚀 New Blog Published: Understanding Formik in React & React Native Forms look simple… until you build one 😅 Managing useState, validation, errors, touched fields, and submit logic can quickly get messy. In my latest blog, I break down: ✅ What Formik is ✅ Why forms become painful without it ✅ How Formik’s inbuilt props like handleChange, values, errors, and handleSubmit save a lot of manual work ✅ A clear mental model of how Formik works under the hood This blog is especially useful if you’re: a beginner in React / React Native confused about handleChange('email') struggling with form validation logic 📖 Read the full blog here: 👉 https://lnkd.in/dte_sYGZ Would love to hear your thoughts or how you’re handling forms in your projects 👇 #React #ReactNative #Formik #WebDevelopment #Frontend #LearningInPublic #JavaScript

🧠 How JSX Really Works Behind the Scenes in React When I started working with React, JSX looked just like HTML to me. But the browser actually doesn’t understand JSX at all. So what really happens behind the scenes? 👇 🔹 JSX is not HTML JSX is just a syntax that makes React code easier to read and write. At the end of the day, it’s still JavaScript. 🔹 Babel converts JSX into JavaScript For example, this JSX: <h1>Hello World</h1> is converted into: React.createElement("h1", null, "Hello World") 🔹 React.createElement returns a JavaScript object This object represents a Virtual DOM node, not the real DOM. 🔹 Virtual DOM and Reconciliation React compares the new Virtual DOM with the previous one and figures out what actually changed. 🔹 Only necessary DOM updates happen Instead of reloading everything, React updates only what’s needed. That’s a big reason why React apps feel fast and smooth. 💡 Understanding this helped me: • Debug React issues more easily • Write cleaner and more optimized components • Feel more confident in machine & technical rounds React looks simple on the surface, but there’s a lot of smart work happening under the hood 🚀 #ReactJS #JavaScript #FrontendDevelopment #JSX #WebDevelopment #LearningReact #ReactTips