⚛️ Mastering ReactJS: Principles Every Pro Developer Must Know 🚀
⚛️ Mastering ReactJS: Principles Every Pro Developer Must Know 🚀 React isn’t just a library — it’s a way of thinking about building user interfaces. If you truly understand its core principles, you move from writing React code… to engineering scalable frontend systems. 💡 Let’s break down the fundamental ReactJS principles every pro developer should master — with deep explanations, examples, and optimization tips. 1️⃣ Declarative UI — Think “What”, Not “How” 🧠 React is declarative , meaning you describe what the UI should look like based on state — not how to manually update the DOM. Instead of: Finding elements Changing properties Updating classes manually You simply describe UI based on state. ❌ Imperative (Vanilla JS mindset) if (isLoggedIn) { showDashboard (); } else { showLogin (); } ✅ Declarative (React way) function App ( { isLoggedIn } ) { return ( < div > {isLoggedIn ? < Dashboard /> : < Login /> } </ div > ...