5 React Concepts Boosting Dev Workflow

What Runs First in React? Most React developers know what useEffect, useMemo, and useCallback do individually. Far fewer know the exact order they execute in. And that gap causes bugs that are surprisingly difficult to trace. Here is the definitive execution order on first mount: -> Step 1: Rendering JSX React runs the function body of your component first. JSX is evaluated. console.log inside the return runs here. This is the render phase. -> Step 2: useMemo runs during render useMemo executes synchronously during the render phase, not after it. If you have an expensive computation wrapped in useMemo, it runs as part of building the component output. This is why useMemo can be used to compute values that are needed in the JSX itself. -> Step 3: useEffect runs after render After the component has rendered and the DOM has been updated, useEffect fires. It is intentionally deferred. This is where API calls, subscriptions, and side effects belong because they should not block the render. -> useCallback is different from all of them useCallback does not run during mounting. It stores a function reference. That function only executes when it is explicitly called. In the example on the right, increment only logs when you actually call increment(). The final order: Rendering JSX, then useMemo, then useEffect. Why this matters in practice: If you expect useEffect to run before useMemo, your state update will not be available when useMemo computes. If you expect useCallback to run automatically, your side effect will never fire. Getting the order wrong means working with stale data and writing code that behaves differently than you intended. Understanding execution order is not academic. It is the difference between components that behave predictably and ones that produce subtle timing bugs you spend hours debugging. Did you know the exact execution order before seeing this or did it surprise you? #React #ReactHooks #FrontendDevelopment #JavaScript #WebDevelopment #Developers

🧠 What Actually Triggers a Re-render in React? Many developers memorize hooks. But fewer understand what really causes a component to re-render. Let’s break it down 👇 Example Code : function App() { const [count, setCount] = useState(0); const memoValue = useMemo(() => { console.log("useMemo runs"); return count * 2; }, [count]); useEffect(() => { console.log("useEffect runs"); }, [count]); return ( <button onClick={() => setCount(count + 1)}> {count} </button> ); } 🔄 What Happens When You Click? 1️⃣ State updates setCount triggers a re-render. 2️⃣ Component re-runs Entire function runs again. 3️⃣ useMemo runs (if dependency changed) 4️⃣ DOM updates 5️⃣ useEffect runs (after render) 🎯 Final Order Render → useMemo → Paint → useEffect 🧠 Important Notes React re-renders when state or props change useMemo runs during render useEffect runs after render useCallback does NOT run — it only stores a function Understanding execution order is what separates React users from React engineers. #ReactJS #FrontendDevelopment #JavaScript #ReactHooks #WebDevelopment #LearningInPublic

Over the last few years working with React, I've realized something - React isn't just about components and hooks. It's about principles. Here are a few React principles that genuinely changed the way I build applications: 🔹 UI is a function of state Once this clicks, everything becomes simpler. Instead of manipulating the DOM, you just focus on managing state properly. 🔹 Keep components small and focused If a component is doing too much, it probably needs to be broken down. Reusability isn’t about being clever - it's about being clear. 🔹 Lift state only when necessary Globalizing everything with Redux/Zustand isn't architecture - it's overengineering. Start simple. Scale when needed. 🔹 Think in data flow, not screens React apps become predictable when data flows in one direction. Debugging becomes easier. Logic becomes cleaner. 🔹 Performance is a mindset, not an afterthought Memoization, lazy loading, code splitting - these aren't "advanced tricks." They’re part of responsible frontend engineering. 🔹 Write for the next developer (which is usually you in 3 months) Clean structure. Meaningful naming. Avoid unnecessary abstractions. React has evolved - from class components to hooks, from CRA to Next.js, from basic SPAs to complex distributed apps. But the fundamentals haven't changed. Master the principles. The patterns will follow. What React principle changed the way you build apps? #ReactJS #ReactNative #FrontendDevelopment #JavaScript #SoftwareEngineering

🔄 Understanding useReducer in React When managing state in React, most developers start with useState. But as applications grow, state logic can become complex. That’s where useReducer becomes very useful. Think of useReducer as a more structured way to manage state, especially when multiple state changes depend on specific actions. 📌 What is useReducer? useReducer is a React Hook that lets you manage state using a reducer function. It works similarly to how reducers work in Redux. It takes two main things: 1️⃣ A reducer function 2️⃣ An initial state const [state, dispatch] = useReducer(reducer, initialState); state → the current state dispatch → a function used to send actions reducer → decides how state should change 📌 Example const initialState = { count: 0 }; function reducer(state, action) { switch (action.type) { case "increment": return { count: state.count + 1 }; case "decrement": return { count: state.count - 1 }; default: throw new Error("Unknown action"); } } function Counter() { const [state, dispatch] = useReducer(reducer, initialState); return ( <> <p>{state.count}</p> <button onClick={() => dispatch({ type: "increment" })}> Increment </button> <button onClick={() => dispatch({ type: "decrement" })}> Decrement </button> </> ); } Here, instead of directly updating state like setCount, we dispatch actions and the reducer decides how the state should change. 📌 When Should You Use useReducer? ✅ When state logic is complex ✅ When multiple state updates depend on each other ✅ When managing objects or multiple state values ✅ When you want predictable state transitions 💡 Key Insight useReducer separates state logic from UI logic, making your components easier to read, test, and maintain. As React applications grow, this pattern helps keep your state management clean and scalable. 💬 Are you using **useState or useReducer more often in your React projects? #React #FrontendDevelopment #JavaScript #WebDevelopment #ReactHooks #LearningInPublic

🚀 10 Powerful Ways to Optimize React Applications (Every Frontend Developer Should Know) React apps can become slow when components re-render unnecessarily or when the bundle size grows. Here are some proven techniques to optimize React performance 👇 1️⃣ Memoization with React.memo Prevents unnecessary re-renders of functional components when props do not change. const MyComponent = React.memo(({ value }) => { return <div>{value}</div>; }); 2️⃣ useMemo Hook Memoizes expensive calculations so they are not recomputed on every render. const sortedList = useMemo(() => { return items.sort(); }, [items]); 3️⃣ useCallback Hook Memoizes functions to prevent unnecessary re-renders in child components. const handleClick = useCallback(() => { setCount(count + 1); }, [count]); 4️⃣ Code Splitting with Lazy Loading Load components only when needed to reduce bundle size. const Dashboard = React.lazy(() => import("./Dashboard")); 5️⃣ Virtualization for Large Lists Use libraries like react-window or react-virtualized to render only visible list items. 6️⃣ Avoid Unnecessary State Keep state minimal and derive values when possible. ❌ Bad const [fullName, setFullName] = useState("") ✅ Good const fullName = firstName + lastName 7️⃣ Key Prop in Lists Always use unique keys to help React efficiently update the DOM. items.map(item => <Item key={item.id} />) 8️⃣ Debouncing and Throttling Improve performance for search inputs and scroll events. Example: lodash debounce 9️⃣ Optimize Images Use compressed images and lazy loading. <img loading="lazy" src="image.png" /> 🔟 Production Build Always deploy optimized production build. #ReactJS #FrontendDevelopment #JavaScript #WebPerformance #Coding #100DaysOfCode #SoftwareEngineering #interview #javascript #post #developer #AI #optimization

Most people think React is just a JavaScript library. But that’s not why React became the most popular frontend technology in the world. React changed how developers think about building interfaces. Before React: UI development looked like this 👇 • Manual DOM updates • Complex UI logic • Hard-to-maintain code • Slow development cycles Then React introduced something powerful: Component-based architecture. Now developers can build apps like LEGO blocks. Small reusable pieces: 🔹 Navbar 🔹 Buttons 🔹 Cards 🔹 Forms 🔹 Dashboards Each component manages its own logic and state. This leads to: ⚡ Faster development ⚡ Cleaner code ⚡ Reusable UI ⚡ Better scalability But the real magic of React is the Virtual DOM. Instead of updating the whole page, React updates only the parts that change. Result? 🚀 Faster applications 🚀 Better user experience 🚀 High performance UI That’s why companies like Meta, Netflix, Airbnb, and Uber rely heavily on React. And with tools like: • Next.js • Redux Toolkit • Tailwind CSS • React Query React has become a complete ecosystem for modern web apps. The question is no longer: "Should you learn React?" The real question is: How well can you master it? What’s your favorite thing about React? 👇 #React #WebDevelopment #JavaScript #Frontend #FullStack #Programming #Tech

⚛️ Why React became one of the most popular tools for building modern web applications When I first started learning frontend development, one thing quickly became clear: As applications grow, managing the UI becomes harder and harder. Updating elements, handling state, keeping everything synchronized… it can easily turn into messy code. This is exactly where React shines. 🚀 Instead of thinking about the page as one big structure, React encourages developers to break the UI into small reusable components. For example: A page can be built from simple pieces like: 🔹 Navbar 🔹 Sidebar 🔹 Product Card 🔹 Button 🔹 Modal Each piece becomes its own component, which makes the application easier to manage and scale. Another powerful idea React introduced is state-driven UI. Instead of manually manipulating the DOM, you simply update the state, and React automatically updates the UI. Example: const [count, setCount] = useState(0); Whenever the state changes, the interface updates automatically. This approach makes applications: ✅ Easier to maintain ✅ Easier to scale ✅ More predictable Over time, I realized that learning React is not just about learning a library — it's about learning a better way to think about building user interfaces. Curious to hear from other developers 👇 #react #reactjs #frontend #webdevelopment #javascript #softwareengineering #coding #developers #frontenddeveloper #programming

🔥 Something BIG for React Developers 🔥 I just released a Dark Developer React Hooks Cheatsheet — and it goes beyond the basics. 🚀 I’ve Completed Part 1: State & Logic Hooks in React Covered: ✅ useState ✅ useReducer ✅ useId ✅ useRef ✅ useImperativeHandle These hooks build the foundation of every React application — managing local state, handling logic, and controlling component behavior. But that’s just the beginning. 👀 The remaining sections go deeper into what makes modern React powerful: - ⚡ Side Effects & External Systems (API calls, subscriptions, DOM measurement) - 🚀 Performance & Responsiveness (Memoization, transitions, deferred rendering) - 🆕 Action Hooks (React 19+) (Modern form handling, optimistic UI) - 🧠 Resource & Advanced Hooks (use(), useEffectEvent, and more) I’ve compiled all of these — with explanations + code examples — into a Dark Developer Cheatsheet. 📄 Check out the full guide here: 👉 React Hooks – Dark Developer Edition Click: https://lnkd.in/dJkQaWdk (Replace with your actual document link) Modern React isn’t just about writing components — it’s about understanding rendering, performance, and user experience at a deeper level. More breakdowns coming soon. 🔥 #React #WebDevelopment #Frontend #JavaScript #ReactJS #DeveloperGrowth

React Hooks completely changed how I write components. When I first started using React, I mostly focused on making the UI work. But once I understood hooks like useState, useEffect, and useMemo, my approach to building components changed completely. Hooks made it possible to: • Manage state in a cleaner way • Separate logic from UI • Reuse behavior across components One small thing I’ve learned while working on React projects: Not every problem needs a new hook. Sometimes the best solution is keeping the component simple and avoiding unnecessary complexity. Clean logic > clever code. Still learning new patterns every day while building with React and Next.js. For React developers here: Which hook do you use the most in your projects? #React #ReactHooks #Nextjs #FrontendDevelopment #WebDevelopment

🚀 Day 14/100: #100DaysOfCode Today was all about understanding the "Why" and "How" behind ReactJS, Next.js, and how they compare to other industry leaders like Vue.js. As I progress through my #100DaysOfCode, I’m realizing that choosing the right tool is just as important as writing the code itself. Here’s a breakdown of what I covered today: 1. What is ReactJS? React is a declarative, component-based JavaScript library for building UIs. It’s fast, flexible, and maintained by Meta (Facebook). The Magic of the Virtual DOM: Instead of refreshing the entire page, React uses a "Virtual DOM" to compare changes and only update the specific elements that actually changed. This is why React apps feel so snappy! 2. ReactJS vs. Next.js: Library vs. Framework ReactJS is a library focused on the View layer. It gives you freedom but requires you to pick your own tools for routing and state management. Next.js is a full-stack framework built on top of React. It comes with "batteries included"—built-in routing, Server-Side Rendering (SSR), and Static Site Generation (SSG) for better SEO and performance. 3. The Landscape: React vs. Next vs. Vue I spent some time comparing these three at a glance: Data Binding: React and Next use one-way data flow (predictable), while Vue supports two-way data binding (faster for simple forms). Scalability: While React is highly flexible, Next.js provides a more structured architecture for complex, large-scale applications. Why choose React? Pros: Simple design (JSX), massive community support, and total freedom to tailor tech stack. Cons: It’s not a full-scale framework out of the box, meaning you’ll need 3rd-party libraries for routing and validation. #100DaysOfCode #ReactJS #NextJS #VueJS #WebDevelopment #Programming #JavaScript #SoftwareEngineering #MERN