💻 What is the difference between synchronous and asynchronous code? Can you give real examples where asynchronous code is needed?, 🔄 How does the event loop work in JavaScript (in simple terms)?, 🧠 What is closure? Can you give a simple example of how it is used?, ⚙️ What is the difference between map(), filter(), and forEach()? When would you use each of them?, 🌐 What is the difference between HTTP methods: GET, POST, PUT, DELETE?, 📦 What is JSON and why do we use it in web development? Can you give an example?, 🏗️ What is the difference between frontend validation and backend validation? Why do we need both?, 🔍 What are common causes of slow performance in a web application? How would you try to fix them?, 🚀 What is a Promise in JavaScript? How is it different from callbacks?, 🧩 What is the difference between SQL and NoSQL databases? When would you choose one over the other?

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