React updates only changed parts of DOM

A React component is a function which returns JSX. When you use that component inside another component, the React creates an element. <Ali /> refers to element of Ali component. So, when React sees <Ali /> it gets it's JSX and internally call React.createElement with details of Ali component such as props, key and children. React.createElement creates an object which is basically description of what needs to be rendered. Then React adds that to the virtual DOM and gets added to real DOM. Tried my best to simplify this concept. Thinking of writing a blog on it. You can subscribe to my newsletter to read in-depth. link in comment. #react #javascript #frontend #programming

🚀 Understanding React Reconciliation Many developers ignore how React updates the DOM. Here are some strategies that consistently work in production 👇 ⚡ 1. Know Virtual DOM Concept React compares previous and new UI efficiently. ⚡ 2. Use Stable Keys Helps React identify changes correctly. ⚡ 3. Avoid Unnecessary DOM Changes Keep structure stable. ⚡ 4. Minimize Tree Depth Shallow trees are faster to diff. ⚡ 5. Optimize Conditional Rendering Avoid frequent mount/unmount cycles. #React #programming #webdevelopment #reactjs  #coding #dailyUpdate #Developer 💻

Most React developers ignore this until their app starts crashing randomly. I recently debugged a frontend issue that didn’t show up in logs, didn’t throw errors… but quietly killed performance over time. Turned out — it was a memory leak in useEffect. Here’s the exact bug (and fix) #React #Frontend #JavaScript #WebDevelopment #MemoryLeaks #Coding #SoftwareEngineering #DevCommunity #CleanCode #Programming

3 React hooks you should use more often: 🔹 useMemo Caches expensive calculations. Recalculates only when dependencies change. 🔹 useCallback Caches a function reference. Prevents unnecessary re-renders in child components. 🔹 useReducer Better than useState for complex state logic. Think of it as a mini Redux. Most devs only use useState and useEffect. The ones above can make a real difference. 🎯 #ReactJS #Frontend #JavaScript #WebDev #Programming

🚀 React Series - Day 10 Avoiding Unnecessary Re-renders with React.memo As applications grow, performance becomes more important. One common issue is unnecessary re-rendering of components. This is where React.memo helps. It is a higher-order component that memoizes a component - meaning it will only re-render if its props actually change. If the props remain the same, React skips rendering that component, improving performance. 👉 This is especially useful for components that: • Receive the same props frequently • Are part of large or complex UIs Used correctly, it can make applications faster and more efficient. #reactjs #javascript #frontenddeveloper #webdevelopment #codinginterview #learnreact #30daysofcode #programming #reactinterview #react #coding

Code doesn’t run by itself. Something runs it for you. 👉 That “something” is called a runtime. It’s the layer between your code and your system. It handles: - Execution - Memory - Communication with the system You don’t see it. But it’s always there. Examples: - Your browser runs JavaScript - Node.js runs backend code - Android runtime runs apps Without a runtime… your code is just text. You click → runtime executes → you see result. This is Part 5 of the series. Tomorrow: how everything connects into one full system. Follow if you want to understand how software actually works behind the scenes. #Programming #Coding #SoftwareDevelopment #WebDevelopment #JavaScript #Nodejs #TechExplained #Developers #ComputerScience

🔁 React hooks run in a specific order. Every single render. Most devs don't know this. And it causes bugs. 👇 On every render, this is the exact order: 1️⃣ Function body runs — useState, useRef, useContext initialize 2️⃣ useMemo and useCallback compute their values 3️⃣ React updates the DOM 4️⃣ useLayoutEffect fires — before the browser paints 5️⃣ Browser paints the screen 6️⃣ useEffect fires — after everything is visible On unmount: useLayoutEffect cleanup → useEffect cleanup → component gone The one thing worth memorizing: useLayoutEffect = before paint useEffect = after paint That single difference explains every flicker bug you've ever had. Did you know the exact order before this? 👇 #ReactJS #JavaScript #Frontend #WebDevelopment #Programming

🚀 React Series - Day 1 Why Everything in React Starts with Components At its core, React is all about components. Instead of building one large UI, React encourages breaking everything into smaller, reusable pieces - like buttons, headers, cards, and sections. This approach makes applications: • Easier to manage • More reusable • Cleaner to scale Modern React mainly uses functional components, which are simple and powerful when combined with hooks. #reactjs #javascript #frontenddeveloper #webdevelopment #codinginterview #learnreact #30daysofcode #programming #reactinterview #react #coding

This is where 90% of React devs lie to themselves. “I know hooks.” No—you don’t. Because if you did: - your components wouldn’t re-render like crazy - useEffect wouldn’t feel like black magic - and you wouldn’t be “optimizing” things that were never slow This isn’t a React problem. It’s a 𝗺𝗲𝗻𝘁𝗮𝗹 𝗺𝗼𝗱𝗲𝗹 𝗽𝗿𝗼𝗯𝗹𝗲𝗺. You’re not thinking in React. You’re trying to control it. And React always wins that fight. Fix how you think → everything else gets easier. Be honest— Which hook still trips you up the most? #reactjs #webdevelopment #frontenddeveloper #softwaredeveloper #javascript #codinglife #programming #reacthooks #devcommunity #learnincode

🚀 React Series – Day 12 useCallback – Preventing Unnecessary Function Re-creation In React, functions are re-created on every render by default. In many cases this is fine, but when passing functions to child components, it can cause unnecessary re-renders. The useCallback hook helps by memoizing functions - so the same function instance is reused unless dependencies change. This is especially useful when working with optimized components (like memoized ones). 👉 In simple terms: • useMemo → memoizes values • useCallback → memoizes functions Used together, they help keep applications efficient and performant. #reactjs #javascript #frontenddeveloper #webdevelopment #codinginterview #learnreact #30daysofcode #programming #reactinterview #react #coding