JavaScript Interview Q&A

What is the difference between var, let, and const?

What are the primitive data types in JavaScript?

What is the difference between == and ===?

What is hoisting in JavaScript?

What is NaN and how do you check for it?

What is the difference between null and undefined?

What are truthy and falsy values in JavaScript?

How does type coercion work in JavaScript?

What is the typeof operator?

How do you convert a string to a number in JavaScript?