React Render vs Repaint Explained

What happens actually when you call setState() (Reconciliation phases) 1. Render phase: - React creates Virtual DOM - Compares it with previous one - Decides what needs to change - No real DOM updates here 2. Commit phase: - React applies the changes to real DOM. - Runs lifecycle methods and hooks like: useLayoutEffect 3. Commit phase (Final step): - Runs side effects: useEffects: - Cleanup of previous effects Understanding reconciliation helps you write better, performance-friendly components. #frontend #reactjs #javascript

Here's a quick visual reminder of why React is so fast! ⚡️ The Virtual DOM acts as a lightweight blueprint. Instead of updating the slow Real DOM for every single change, React compares the new blueprint with the old one and only updates what's absolutely necessary. This "diffing" process is the key to high-performance UIs. What's your favorite way to explain this to new devs? #ReactJS #WebDevelopment #Performance #JavaScript #FrontEnd

Understanding stale closures in React took me longer than I expected. While working with useEffect, I ran into a situation where my code was using outdated state values. Everything looked correct at first, but the behavior wasn’t. This pushed me to really understand: how closures work in React why useEffect “sees” the world as it was when it was created when useRef is the right solution (and when it’s not) I wrote a blog post with real examples and trade-offs based on what I learned: 👉 [https://lnkd.in/dudVcZdM #React #JavaScript #NextJS #Frontend #WebDevelopment

Hey there! I've posted about why React’s upcoming <ViewTransition> feature is a big deal - how it fixes jarring SPA page transitions, makes navigation feel smooth and contextual, and why once it becomes stable, abrupt “teleport-style” page changes will feel outdated. #React #ReactJS #FrontendDevelopment #WebDevelopment #JavaScript #ViewTransition #SPA

Optimize Re-renders with React.memo Avoid unnecessary re-renders in React functional components by using React.memo. It memoizes your component and only re-renders it when props change — great for performance! Typing in the input won’t trigger a re-render of the Child component because it’s wrapped with React.memo. Less re-render = smoother performance! #ReactJS #JavaScript #FrontendDevelopment #WebDevelopment #ReactTips #CodingTips

🌱 React Component Lifecycle – Made Easy In React, each component follows a natural flow, similar to a life journey: Mounting → Updating → Unmounting ✨ Main Lifecycle Stages: 🔹 Mounting The component is initialized and rendered on the screen for the first time. 🔹 Updating The component re-renders whenever there is a change in state or incoming props. 🔹 Unmounting The component is removed from the UI when it’s no longer needed. 💡 Having a clear understanding of the component lifecycle allows developers to manage state efficiently, handle API requests at the right time, and improve application performance. #ReactJS #FrontendDeveloper #JavaScript #WebDevelopment #ReactLearning #UIDevelopment #CodingJourney

Ever stared at your console and screamed, "Why is this function repeating itself?!" The Answer: It usually happens when you perform a state update inside a useEffect hook but forget the dependency array. Here is what is happening under the hood: The component renders. The effect runs and updates the state. The state update triggers a re-render. Without a dependency array, the effect runs again... and the cycle never ends. To fix it, always define when the effect should run by adding [] (run once) or [prop] (run on change). #ReactJS #JavaScript #WebDevelopment #CodingTips #SoftwareEngineering #Frontend

Most React bugs are not caused by React itself. They’re caused by how we think about components 🧠 Many developers treat components like “pages”. But React components are closer to pure functions: - UI = f (state, props) Here’s the practical rule I use 👇 If a component: - does more than one job - owns state it doesn’t really need - re-renders without a clear reason it’s usually a mental model problem, not a React one... React isn’t magic. It’s discipline in disguise. What React concept changed the way you write components? #React #Frontend #WebDevelopment #JavaScript #CleanCode

🚀 Understanding the React.js Reconciliation Process I’ve refined this visual to show how React efficiently updates the UI by comparing the Virtual DOM with the Real DOM. React’s Reconciliation algorithm works in two key steps: 🔹 Diffing – Detects what has changed between renders 🔹 Updating – Applies only the necessary changes to the Real DOM This is what makes React fast, efficient, and smooth when building dynamic user interfaces. If you’re learning React, mastering this concept helps you understand: ✔ Why re-renders happen ✔ How React minimizes DOM operations ✔ How performance is optimized behind the scenes A small concept — but a big performance win 💡 #ReactJS #FrontendDevelopment #WebDevelopment #JavaScript #Reconciliation #VirtualDOM #RealDOM #UIDevelopment #LearningReact

In my last post, I explained the difference between static and dynamic routes in Next.js. This is the follow up. Once you understand what static and dynamic routes are, the next question is what actually makes a route dynamic. Here are the most common ways routes become dynamic, often without you realizing it. 👇 Which one have you run into before? #Nextjs #React #Frontend #WebDevelopment #Javascript #Typescript #ProgrammingTips