React State Updates: Understanding the Asynchronous Process

Revisiting React Fundamentals 🚀 Over the past few days, I went back to the core concepts of React to strengthen my foundation. Instead of rushing into advanced libraries, I focused on understanding how React actually works under the hood. Here’s what I’ve revised and practiced so far: 🔹 JSX & component structure Understanding how UI is broken into reusable components and how JSX makes UI logic more readable. 🔹 Props vs State How data flows in React, passing props between components, and managing dynamic UI with useState. 🔹 Event handling Handling user interactions like clicks, inputs, and form submissions in a clean React way. 🔹 Conditional rendering Rendering UI based on conditions (ternary, &&, etc.) to make components dynamic. 🔹 useEffect basics Handling side effects like API calls, timers, and lifecycle behavior with useEffect. 🔹 Basic project structure Organizing folders, separating components, and writing cleaner, scalable code. Why this revisit? I realized strong fundamentals make advanced topics like performance optimization, state management, and full-stack development much easier to grasp. Currently continuing with: ➡️ Building small projects ➡️ Practicing problem solving ➡️ Strengthening JavaScript + React together Always open to feedback and learning from the community. What React concept do you think every developer should master early? #React #FrontendDevelopment #WebDevelopment #JavaScript #LearningInPublic #100DaysOfCode #DeveloperJourney #ReactJs

📌 Today I learned: useReducer — React's powerful alternative to useState When state logic gets complex, useReducer brings structure and clarity. The core concept: ``` const [state, dispatch] = useReducer(reducer, initialState); ``` Instead of directly updating state, you dispatch **actions**. The reducer — a pure function — takes the current state + action and returns the next state. 🔑 Key benefits I discovered: → Centralised logic — all state transitions live in one function → Easier debugging — every state change has an explicit action → Scales better — perfect for complex UI with multiple transitions → More testable — reducers are just pure functions! UseReducer shines when: • You have 3+ related state variables • State updates depend on previous state • Multiple actions affect the same piece of state Think of it like Redux — but built right into React, no extra libraries needed. One day of learning, but the concept already feels foundational. Excited to keep building with it! 🚀 #ReactJS #useReducer #StateManagement #JavaScript #WebDevelopment #FrontendDev #LearningInPublic

I spent months confused by React. Then I stopped trying to learn everything and focused on the right things in the right order. Here's the sequence that actually worked for me: 1/ Understand WHY React exists Not how it works — why. Once you get that it solves the problem of keeping UI in sync with data, everything clicks faster. 2/ Master `useState` & `useEffect` first. Don't jump to Redux or Zustand. 80% of real-world React apps live inside these two hooks. Get comfortable here before moving on. 3/ Think in components, not pages This is the mindset shift most beginners skip. Break every UI into small, reusable pieces. It changes how you design AND how you debug. 4/ Learn props deeply Passing data the right way, lifting state up, avoiding prop drilling — this is where junior devs struggle the most. Nail this early. 5/ Build something ugly and ship it No tutorial prepares you for real problems. Build a small project, break it, fix it, and deploy it. That's where the actual learning happens. React isn't hard. The order in which most people learn it is. #React #WebDevelopment #Frontend #JavaScript #LearningToCode #SoftwareEngineering #IndianDevelopers

📅 Day 5 with React — sometimes revision is the real progress. 🔄 Not every day is about learning something brand new. Today I slowed down. Revisited everything from the past 4 days. And honestly? That's when things REALLY clicked. 👇 🔁 What I revised today: → How the Virtual DOM works and why React is fast → Vite and why it replaced Create React App completely → Babel converting JSX to plain JavaScript behind the scenes → Folder structure and what every file actually does → Components — breaking UI into small reusable pieces → Props — passing data from parent to child → useState — why it's a trigger, not just a variable → Child to Parent communication using callback functions 4 days of concepts. One revision session. Everything feels sharper now. 💡 What revision actually taught me: When I first learned props — I just used them. Today I understood WHY they exist. When I first learned useState — I just called it. Today I understood what React does AFTER you call it. There's a huge difference between using a concept and understanding it. Revision is where that gap closes. 🎯 🧠 The thing nobody tells beginners: Everyone talks about learning fast. Moving fast. Building fast. But the devs who actually get good? They slow down. They go back. They ask WHY — not just HOW. → Why does React re-render on state change? → Why does data only flow downward by default? → Why does Babel exist at all? Asking WHY turns you from a copy-paster into a problem solver. 📌 Day 5: No new topic today. Just pure revision. And I feel more confident about React now than I did after Day 1, 2, 3 and 4 combined. Sometimes the best move is to go back before you go forward. 🔥 Day 6 — back to building. Let's go 🚀 Are you learning React too? Follow along — documenting everything daily 👇 #React #ReactJS #JavaScript #WebDevelopment #Frontend #100DaysOfCode #LearnInPublic #Day5 #SheryiansCodingSchool #CodingJourney #Revision

⚛️ Stop using useEffect for everything. One of the biggest shifts in my React journey was realizing this: 👉 Not everything belongs in useEffect. At the beginning, I used useEffect for: calculations derived state syncing values even simple logic 🤦♂️ It “worked”… but it made my components: ❌ harder to read ❌ harder to debug ❌ less predictable Then I learned the key idea: 💡 If something can be calculated during render — do it there. Example mistake: Using useEffect to calculate filtered data. Better: Just compute it directly in render. React is designed to re-render. Let it do its job. 👉 useEffect should be used only for: API calls subscriptions interacting with external systems Not for internal logic. 🎯 My rule now: “If it doesn’t touch the outside world — it doesn’t need useEffect.” This one mindset shift made my code: ✔️ cleaner ✔️ more predictable ✔️ easier to maintain Curious — what was your biggest “aha moment” with React? 👇 #ReactJS #FrontendDevelopment #JavaScript #CleanCode #WebDevelopment #SoftwareEngineering

🚀 React Hooks Small Projects I recently worked on a few small projects to better understand some important React Hooks. In this video, I demonstrated how these hooks work with simple examples so that beginners can easily understand their usage. 🔹 useState – Used to manage state inside a functional component. It helps update and display dynamic data in the UI. 🔹 useEffect – Used to handle side effects in React applications such as API calls, timers, and updating the DOM when state changes. 🔹 useContext – Helps share data globally across components without passing props manually through every level. 🔹 useReducer – A powerful hook for managing complex state logic, especially when multiple state updates depend on different actions. 🔹 useMemo – Optimizes performance by memoizing expensive calculations so they only run when dependencies change. 🔹 useCallback – Returns a memoized function to prevent unnecessary re-renders when passing functions to child components. These mini projects helped me strengthen my understanding of React Hooks and component optimization techniques. 📌 If you watch the video, you can easily understand how each hook works in a practical way. #ReactJS #ReactHooks #WebDevelopment #MERNStack #JavaScript #FrontendDevelopment #CodingPractice

A very common React mistake I see developers make: Mutating State When I was learning React, one concept that changed the way I write code was this rule: 👉 React state must never be mutated.its always immutable. But why? React does not deeply compare objects or arrays when state updates. Instead, it performs a reference(memory) comparison. That means React checks: Old State === New State ? If the reference is the same, React assumes nothing changed and skips re-rendering. Example of a mistake: cart.push(product) // ❌ Mutating state setCart(cart) Here we modified the same array in memory, so React may not detect the change because the memory location is same.so no re-render..no UI update. The correct approach is immutability: setCart([...cart, product]) // ✅ Creating a new array Now React sees a new reference, triggers reconciliation, and updates the UI correctly. 💡 Why React prefers immutability: • Faster change detection • Predictable state updates • Easier debugging • Better performance This small concept explains why patterns like: map() filter() spread operator (...) are used so frequently in React. because all this returns new object or array... Understanding this helped me write cleaner and more reliable React components. What React concept took you the longest to understand? 🤔 #React #Frontend #JavaScript #WebDevelopment #ReactJS

 Understanding Vite, Project Structure & HMR Today I focused on understanding how modern React development environments work, especially when using Vite. One of the first things I explored was the project folder structure. Understanding the structure helps in organizing components, assets, and logic properly so that the application remains scalable and maintainable. A clean structure makes it easier for teams to collaborate and manage large frontend applications. I also learned about Vite, a modern frontend build tool that significantly improves the development experience. Unlike traditional bundlers, Vite uses native ES modules during development, which allows the dev server to start almost instantly and makes updates much faster. Another interesting concept I studied was Hot Module Replacement (HMR). With HMR, when we modify a file in the project, the changes are instantly reflected in the browser without reloading the entire page. This helps preserve the application state and makes development much faster and smoother. Understanding these tools gives a clearer picture of what happens behind the scenes when building modern frontend applications with React. Still learning and exploring the ecosystem every day. #React #Vite #FrontendDevelopment #WebDevelopment #JavaScript #LearningInPublic

The "Back to Basics" Approach Best for: Establishing yourself as a lifelong learner or mentor. Headline: Mastering the Building Blocks of React ⚛️ Even as the React ecosystem grows with new hooks and frameworks, the core principles remain the same. Understanding these 6 main concepts is the difference between writing code that "just works" and writing code that is scalable and efficient. 🧩 Components: The puzzle pieces of your UI. 📝 JSX: Bringing the power of HTML into JavaScript. 📥 Props: How we pass data down the tree. 💾 State: The local memory of your component. ⚡ Events: Handling user interaction across all browsers seamlessly. 🔄 Lifecycle: Understanding the "birth" and "death" of a component. Which of these concepts was the hardest for you to grasp when you first started? Let’s discuss in the comments! 👇 #ReactJS #WebDevelopment #Frontend #CodingTips #SoftwareEngineering

🚀 7 Reasons Why React is So Powerful React is everywhere. But understanding why it works so well is what separates beginners from real developers. Here are 7 core features that make React stand out: 🔹 Virtual DOM Updates only the changed parts of UI → faster performance and smoother user experience. 🔹 Component-Based Architecture Break UI into small reusable pieces → clean, scalable, and maintainable code. 🔹 Reusability Write once, reuse across the app → faster development and consistency. 🔹 JSX (JavaScript XML) Write HTML-like code inside JavaScript → improves readability and developer productivity. 🔹 Declarative Approach Focus on what the UI should look like → React handles the updates efficiently. 🔹 Strong Ecosystem Huge community, tools, and libraries → faster problem solving and development. 🔹 Hooks Simplify state and lifecycle management → cleaner and more powerful functional components. — Anuj Pathak #reactjs #javascript #webdevelopment #frontenddevelopment #softwareengineering #developersoflinkedin #programming #coding #techlearning #learninginpublic #buildinpublic