1: What are functions as first-class citizens in JavaScript?
2: How can you pass arguments to a function in JavaScript?
3: What is a callback function in JavaScript?
4: Explain the concept of hoisting in JavaScript.
5: What is an immediately invoked function expression (IIFE)?
6: What is the purpose of the return statement in a function?
7: How do you handle errors in JavaScript?
8: What is the try...catch statement in JavaScript?
9: How can you create an empty object in JavaScript?
10: What is the purpose of the this keyword in JavaScript?
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