20 Common Interview Questions in JavaScript for 2024

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Sridhar Raj P

Sridhar Raj P

?? On a mission to teach 1 million students | Developer & Mentor | 7,550+ Students ?? | Material UI | CoreUI | JavaScript | React JS | Redux | Python | Java | Springboot | MySQL | Self-Learner | Problem Solver

发布日期: 2024年4月25日

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1. What is JavaScript? Can you explain its role in web development?
2. What are the differences between JavaScript and other programming languages like Java or Python?
3. What are the new features introduced in the latest version of JavaScript (ECMAScript 2023/2024)?
4. Explain the concept of hoisting in JavaScript.
5. What is the event loop in JavaScript and how does it work?
6. How do you handle asynchronous programming in JavaScript?
7. What is a closure in JavaScript? Provide an example.
8. Explain the concept of prototypal inheritance in JavaScript.
9. How can you optimize the performance of JavaScript code?
10. What are the differences between == and === operators in JavaScript?
11. How do you handle errors and exceptions in JavaScript?
12. Explain the difference between let, const, and var in JavaScript.
13. What is a promise in JavaScript? How do you use it?
14. What are some ES6 features you frequently use in your code?
15. How do you debug JavaScript code?
16. Explain the concept of scope in JavaScript.
17. What are arrow functions in JavaScript? How do they differ from regular functions?
18. How do you handle cross-origin resource sharing (CORS) in JavaScript?
19. What are the different data types in JavaScript?
20. Can you explain the concept of a callback function in JavaScript? Provide an example.

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