React State Management Essentials

Day 89 / 365 👨💻 Spent time improving understanding through practice. 🧩 Reworked a small component setup 🔁 Observed how state changes affect UI ⚙️ Simplified some existing logic 🧠 Focused on clarity over complexity #365DaysOfCode #React #JavaScript #Frontend

Day 94 / 365 👨💻 Kept building consistency with React practice. 🧩 Worked on a small component tweak 🔁 Observed how UI updates with state changes ⚙️ Fixed minor issues in logic 🧠 Focused on keeping code simple and readable #365DaysOfCode #React #JavaScript #Frontend

⚛️ React Concept: useEffect Explained Simply The "useEffect" hook lets you handle side effects in functional components — like API calls, subscriptions, and DOM updates. 🔹 It runs after the component renders 🔹 You can control when it runs using the dependency array Basic syntax: useEffect(() => { // side effect logic return () => { // cleanup logic (optional) }; }, [dependencies]); 📌 Common use cases: • Fetching data from APIs • Adding event listeners • Handling timers 📌 Best Practice: Always define dependencies correctly and use cleanup functions to avoid memory leaks. #reactjs #frontenddevelopment #javascript #webdevelopment #softwareengineering

useEffect is probably the most powerful - and most misused - hook in React. 🎯 Arun explained it really well, sharing this because I've made  these exact mistakes in real projects: → Forgetting the cleanup function - memory leaks in production 😅 → Wrong dependency array - stale data showing up in dashboards → Fetching data inside useEffect - unnecessary re-renders and   race conditions What changed for me: ✅ Always write cleanup for subscriptions and event listeners ✅ Use React Query for data fetching — avoids most useEffect complexity ✅ Think twice before adding objects/arrays as dependencies 2.5 years of React and useEffect still teaches me something new. What's your most common useEffect mistake? Drop it below 👇 #ReactJS #Frontend #JavaScript #WebDevelopment #FrontendDeveloper

⚛️ React Concept: useState Explained with Real Examples The "useState" hook allows you to add state management to functional components. It helps you store and update data that changes over time — like user input, counters, or UI state. Basic syntax: const [state, setState] = useState(initialValue); 🔹 "state" → current value 🔹 "setState" → function to update the value 📌 Common use cases: • Counter functionality • Form inputs • Toggle UI (show/hide) 📌 Best Practice: Always update state using the setter function and avoid directly mutating state. #reactjs #frontenddevelopment #javascript #webdevelopment #softwareengineering

What is a Component? A reusable building block of a user interface. 🔹 Functional Components ⚡ ✔ Simple & easy to write ✔ Use Hooks (useState, useEffect) ✔ Preferred in modern React 🔹 Class Components 🏗 ✔ Uses lifecycle methods ✔ More complex structure ✔ Mostly replaced by Hooks 🔹 Why Components Matter? 🔁 Reusable code 📂 Organized structure 🚀 Faster development #ReactComponents #ReactJS #FrontendDevelopment #JavaScript

Day 111 / 365 👨💻 Stayed consistent with React work. 🧩 Tweaked a small component 🔁 Observed state-driven UI changes ⚙️ Cleaned up some logic 🧠 Focused on keeping code simple #365DaysOfCode #React #JavaScript #Frontend

🚀 💡 JavaScript Tricky Question Explanation const arr = [4, 10, 2, 8]; const result = arr.find(num => num > 5) + arr.findIndex(num => num > 5); console.log(result); 👉 Output: 11 👉 Explanation: * find() returns the first value > 5 → `10` * findIndex() returns its index → `1` * Final result → `10 + 1 = 11` ⚡ Both stop at the **first match** #JavaScript #WebDevelopment #Frontend #CodingInterview #JSConcepts

What is a closure in JavaScript? A closure is a function that remembers variables from its outer scope even after that scope has finished executing. Why does this work? - `createCounter` runs once - It creates a variable `count` - The inner function “closes over” that variable - Even after `createCounter` finishes, `count` is still accessible Each time `counter()` runs: → it uses the same preserved state 💡 Closures are everywhere: - React hooks - Event handlers - Memoization - Encapsulation patterns They’re not just a concept — they’re part of how JavaScript manages state. #Frontend #JavaScript #React #WebDevelopment #SoftwareEngineering

Built a small frontend project — a Gradient Generator 🎨 Focused on improving my understanding of DOM manipulation, event handling, and dynamic UI updates using JavaScript. ⚙️ Features: • Random gradient generation • Direction control • Live preview • One-click copy 🌐 Live Demo: https://lnkd.in/gcQSkiWS 📂 GitHub: https://lnkd.in/g8H34Ped A simple build, but a good step forward in strengthening fundamentals. #webdevelopment #frontend #javascript