React UI Creation with createElement and createRoot

⚛️ How React Works (Virtual DOM Explained) React improves performance by using a concept called the Virtual DOM. Instead of updating the entire UI, React: • Creates a virtual copy of the DOM • Compares it with the previous version • Finds only the changes (diffing) • Updates only the necessary parts This makes React fast and efficient for building modern user interfaces. 👉 Smart updates = Better performance Have you used Virtual DOM in your projects? #ReactJS #FrontendDevelopment #JavaScript #WebDevelopment #SoftwareEngineering

React Rendering Flow — simplified 👇 Every UI update in React follows a structured process: ▪️ Trigger (state/props/event) ▪️ Virtual DOM creation ▪️ Diffing old vs new ▪️ Reconciliation ▪️ Efficient DOM update React doesn’t blindly update the DOM — it calculates the minimum changes needed. This is what makes React fast ⚡ Understanding this changed how I design components. What part of React internals do you find confusing? #React #FrontendDevelopment #WebDevelopment #JavaScript

DAY 12 React Renders Are Just Function Calls REACT RENDERS ARE JUST FUNCTION CALLS A React component is just a function. Rendering is just calling that function. Strip away all the magic — a React functional component is literally a JavaScript function that returns JSX. When React "renders" it, it calls the function. The output (JSX) is transformed into React.createElement() calls, producing a plain object description of the UI. Nothing is painted yet at this stage. React is just building a description. The DOM work comes later. Understanding that rendering = function call demystifies hooks, closures, and why the order of hooks must never change. Did this mental model shift how you think about React? #ReactInternals #JSX #JavaScript #WebDevelopment

"Great UI isn’t just about what users see — it’s about when things happen behind the scenes. Understanding the difference between useEffect and useLayoutEffect helps build smoother and more predictable React applications." 🚀 #React #FrontendDevelopment #JavaScript #WebDevelopment

Conditional rendering is one of the simplest ways to make React components actually reusable. You build a component… then reuse it somewhere else and realize it’s carrying extra UI you don’t need (In my case, I didn’t want the View button showing everywhere ) Instead of duplicating it, make parts optional: "showView && <ViewButton />" Control it with props. Same component, different behavior. Reusable components aren’t rigid They adapt. #ReactJS #Frontend #CleanCode #JavaScript

useState vs useRef in React | Best Practices for Better Performance useState → Used to store state that updates the UI and causes component re-render. useRef → Used to store mutable values that persist between renders without causing re-render. useState is best when the value change should reflect on the screen. useRef is best when you need to keep a value without affecting rendering, such as DOM access, timers, or previous values. Using useState everywhere can cause unnecessary re-renders, while using useRef correctly helps improve performance in large React applications. Rule: If UI changes → useState If UI does not change → useRef #ReactJS #JavaScript #FrontendDevelopment #ReactHooks #MERNStack #SoftwareEngineering #WebDevelopment

Just shipped a React Virtual DOM Visualizer 🚀 I built this to make React rendering behavior easier to see instead of just explain. You can now: Compare Real DOM full re-renders vs Virtual DOM diffing side-by-side Run update patterns (single, random, range, all) Track commit duration with a benchmark timeline Toggle memoization and slow-motion to understand what changes and why Great for interviews, mentoring, and frontend performance learning. Try it here: https://lnkd.in/gGceydHz #React #NextJS #WebPerformance #Frontend #JavaScript #VirtualDOM #RealDOM #ReactVisualizer #UIEngineering

Today I explored some core concepts of React that changed the way I see frontend development : • How React works behind the scenes • Rendering process in React • Virtual DOM vs Real DOM • Diff Algorithm (how react updates efficiently) • Client Side Rendering (CSR) • Server Side Rendering (SSR) One thing I found really interesting is how React uses the virtual DOM and diff algorithm to update only the necessary parts of the UI, making apps faster and more efficient. I'm excited to dive deeper and build more projects using these concepts! #React #Javascript #MernStackDevelopment

"Mastering React starts with its core building blocks: Components, Props, State, and Hooks (especially useState). Components are the reusable pieces of your UI, passing data down via props (read-only) while managing dynamic behavior through state. With the introduction of Hooks in React 16.8, useState revolutionized how we handle local state in functional components — no more class boilerplate! A quick reminder: Props → Data flow from parent to child (immutable from child's perspective) useState → [value, setValue] = useState(initialValue) — triggers re-renders on updates #ReactJS #JavaScript #FrontendDevelopment #WebDevelopment #ReactHooks"