1. Explain the event loop, call stack, and task queue. How does JavaScript handle asynchronous operations? What happens when setTimeout, Promise, and async/await are used together? 🧠 2. What is the difference between null, undefined, and undeclared variables? Bonus: What is the result of typeof null? 🌀 3. How does JavaScript handle closures? Can you give a real-world use case? js Copy Edit function outer() { let count = 0; return function inner() { return ++count; }; } ⛓️ 4. What is a promise chain and how does it differ from async/await? When would you prefer one over the other? ⚙️ 5. What is the difference between == and ===? What are the edge cases for type coercion in JavaScript? Explain: [] == ![] Explain: [] + [], [] + {} and {} + [] 🧩 6. What is hoisting in JavaScript? What gets hoisted and what doesn’t? What’s the difference in hoisting between var, let, and const? 🧬 7. Explain prototypal inheritance vs classical inheritance. How does JavaScript’s prototype chain work? 🏗️ 8. What are JavaScript modules and how do ES6 modules differ from CommonJS? How would you implement a module loader? 🕸️ 9. How does the this keyword work in different contexts (global, object method, arrow function, etc.)? js Copy Edit const obj = { method() { console.log(this); } }; const fn = obj.method; fn(); // What is `this` here? 📚 10. What is the difference between Object.freeze(), Object.seal(), and Object.preventExtensions()? Which one allows you to modify properties but not add or delete?