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A collection of common JavaScript performance questions and answers.
Practice these questions and get feedbacks! It will help you improve your answer.
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1. What is the purpose of the rest parameter?
2. What is the purpose of the event loop?
3. What is the purpose of the arrow function?
4. What is the difference between a for loop and a forEach loop?
5. What is hoisting?
6. What is the purpose of the spread operator?
7. What is the difference between a shallow copy and a deep copy?
8. What is the difference between == and ===?
9. What is the purpose of a closure?
10. What is the difference between let, const, and var?