React State Not Updating: Common Mistake in 30 Days

📚 Today’s Learning – React Strict Mode 1.It runs additional checks and warnings for unsafe lifecycle methods, unexpected side effects, and deprecated APIs. 2.One interesting behavior is that components may render twice in development to help detect side effects. 💡 Key takeaway: Strict Mode doesn’t affect production builds, but it helps catch bugs early during development and encourages writing safer, cleaner React code. #ReactJS #FrontendDevelopment #WebDevelopment #JavaScript #CodingJourney #LearnInPublic

🚀 30 Days — 30 Coding Mistakes Beginners Make Day 19/30 I left a page… and React threw a scary warning 😐 “Can't perform a state update on an unmounted component” I wasn’t even touching state. The real culprit? setTimeout. The user navigated away, but the timer still executed and tried updating state. Component gone ❌ Timer still running ✔️ Fix 👇 return () => clearTimeout(timer) Always clean up inside `useEffect`. Timers, listeners, and API calls must be cancelled. Small habit. Prevents huge debugging sessions. Have you faced this warning? #30DaysOfCode #reactjs #javascript #frontend #codeinuse

COMMON REACT MISTAKES Developers Should Avoid While learning React, most errors don’t come from syntax — they come from small mistakes in state, rendering, and structure. This post covers some common mistakes developers make: • Mutating state directly • Using incorrect keys • Overusing global state • Misusing useEffect • Storing derived state • Causing unnecessary re-renders • Not handling loading and error states • Poor project structure Avoiding these mistakes early can make React applications cleaner and easier to maintain. 📌 Save this for revision. #React #FrontendDeveloper #WebDevelopment #JavaScript #InterviewPrep #LearningInPublic #ReactJS #Consistency

🚀 Day 17 of My Coding Journey Today I learned about the useRef() hook in React and also got introduced to the register concept in forms. These concepts helped me understand how React can directly interact with DOM elements and manage form inputs more efficiently. 📚 What I learned today: • Using useRef() to access and manipulate DOM elements • Understanding how refs persist values without causing re-renders • Basics of the register approach in forms • Improving form handling with better structure and performance 💡 One key takeaway: Unlike state, useRef() does not trigger re-renders, which makes it very useful for handling focus, inputs, and performance optimizations. Step by step, getting deeper into React and understanding how things work behind the scenes. ⚛️💻 #Day17 #ReactJS #useRef #FrontendDevelopment #JavaScript #WebDevelopment #LearningInPublic

React is important not only because of its popularity, but because it teaches developers a better way to think about building interfaces. Instead of writing large messy code, React encourages developers to break the UI into small reusable components. This makes applications easier to understand, maintain, and scale. Learning React is not just learning a tool. It is learning a modern mindset for building software. #React #FrontendDevelopment #WebDevelopment #JavaScript

React becomes much cleaner when you understand destructuring. One of the most useful JavaScript features in React is destructuring. It helps you pull values out of props, state, and objects in a cleaner and more readable way. Instead of writing: const name = props.name; const age = props.age; you can write: const { name, age } = props; Even better, directly in a component: function Profile({ name, age }) { return <p>{name} is {age} years old.</p>; } You’ll also see destructuring in useState all the time: const [count, setCount] = useState(0); Here: count = current state value setCount = function to update it Why this matters in React: cleaner code better readability fewer repeated references like props. or user. easier component maintenance Destructuring is small, but it makes a big difference in writing modern React code. If you're learning React, master this early — you'll use it in almost every component. What’s one React feature that felt confusing at first but now feels essential? #React #JavaScript #FrontendDevelopment #WebDevelopment #ReactJS #Coding #SoftwareDevelopment #100DaysOfCode #Programming #LearnToCode

Mastering React Hooks is a game-changer for building scalable and efficient applications. ⚛️ From managing simple state to handling complex logic, React Hooks make functional components more powerful and maintainable. 🔹 useState — Manage component state 🔹 useEffect — Handle side effects like API calls 🔹 useContext — Share global data across components 🔹 useRef — Access DOM elements without re-render 🔹 useReducer — Manage complex state logic 🔹 useMemo & useCallback — Optimize performance 🔹 Custom Hooks — Reuse logic efficiently Understanding when and why to use each Hook helps in writing cleaner, reusable, and production-ready React code. 📌 Save this post for quick revision 📌 Share with fellow developers 📌 Keep learning, keep building #React #ReactJS #FrontendDevelopment #WebDevelopment #JavaScript #FullStackDeveloper #MERNStack #SoftwareDeveloper #CodingLife #LearnToCode #TechCareer #ReactHooks #DeveloperCommunity #100DaysOfCode #Programming

Closures in JavaScript are confusing… until they’re not 👇 Most developers memorize definitions. Very few actually understand what’s happening behind the scenes. Here’s the truth: 👉 A closure is just a function that remembers its outer variables Even after that outer function has finished executing 🤯 💡 That’s why this works: A function creates a variable Another function uses it later And somehow… it still remembers it That “memory” is called a closure ⚡ Simple rule: Closure = Function + Memory 🚀 Why you should care: Core concept in React (hooks, callbacks) Asked in almost every frontend interview Helps you write clean, powerful code If you understand this, you’re already ahead of 80% of developers 💯 👇 Comment “JS” if you want more concepts like this 🔁 Save this for revision 🚀 Follow for daily JavaScript + DSA content #javascript #reactjs #webdevelopment #frontend #coding #programming #developers #dsa #100DaysOfCode

Frontend Learning — Understanding Reconciliation in React One of the most important concepts to understand in React is the Reconciliation process — how React updates the UI efficiently. -> What is Reconciliation? Reconciliation is the process where React: Compares the Virtual DOM with the previous version Finds what actually changed Updates only those parts in the real DOM -> Without this concept: Full DOM updates ( slow ) Poor performance Unnecessary re-renders -> With Reconciliation: Minimal DOM updates Better performance Faster UI rendering 🧠 How React decides updates: If element type changes → full re-render If same type → update only changed props Uses keys to track list items efficiently 💡 Key Takeaway: React is fast not because of magic… -> It’s fast because it updates only what’s necessary #ReactJS #FrontendDevelopment #JavaScript #WebDevelopment #Performance #VirtualDOM #CodingTips #LearnInPublic #DeveloperJourney

Learning React without JavaScript is like reading a novel in a language you don’t understand. You can see the words. You can even repeat the sentences. But you don’t truly understand what’s happening. That’s exactly what happens when you jump straight into React 👇 • You use hooks, but don’t understand closures • You manage state, but don’t know how JS works behind it • You copy code, but can’t debug when it breaks At that point, you’re not coding — you’re just memorizing patterns. React is not magic. It’s just JavaScript… with structure. If your JavaScript is weak, React will feel confusing. If your JavaScript is strong, React will feel simple. So don’t rush. Master JavaScript first. React will follow naturally. #javascript #reactjs #webdevelopment #frontend #programming #coding #softwaredeveloper #100daysofcode #learninpublic