• What is JavaScript?
• What is hoisting
• What is closures in JS
• What is event loop
• What is this keyword
• Virtual DOM vs Real DOM
• Explain the difference between let, const, and var.
• What is the difference between == and ===?
• Explain the difference between function declaration and function expression.
• How does the setTimeout function work?

Functions and scope

• Describe the differences between function, call , apply, and bind.
• What is a callback function?
• Explain the concept of a pure function
• What is the purpose of the arguments object in a function?
• How do you create a closure in JavaScript?
• What is the difference between a shallow copy and a deep copy?
• How does the call stack work in JavaScript?
• Explain the concept of function currying.
• How can you avoid callback hell in JavaScript?