Here are the 50 JavaScript interview questions for 2024

1. What is JavaScript?
2. What are the data types in JavaScript?
3. What is the difference between null and undefined?
4. Explain the concept of hoisting in JavaScript.
5. What is a closure in JavaScript?
6. What is the difference between “==” and “===” operators in JavaScript?
7. Explain the concept of prototypal inheritance in JavaScript.
8. What are the different ways to define a function in JavaScript?
9. How does event delegation work in JavaScript?
10. What is the purpose of the “this” keyword in JavaScript?
11. What are the different ways to create objects in JavaScript?
12. Explain the concept of callback functions in JavaScript.
13. What is event bubbling and event capturing in JavaScript?
14. What is the purpose of the “bind” method in JavaScript?
15. Explain the concept of AJAX in JavaScript.
16. What is the “typeof” operator used for?
17. How does JavaScript handle errors and exceptions?
18. Explain the concept of event-driven programming in JavaScript.
19. What is the purpose of the “async” and “await” keywords in JavaScript?
20. What is the difference between a deep copy and a shallow copy in JavaScript?
21. How does JavaScript handle memory management?
22. Explain the concept of event loop in JavaScript.
23. What is the purpose of the “map” method in JavaScript?
24. What is a promise in JavaScript?
25. How do you handle errors in promises?
26. Explain the concept of currying in JavaScript.
27. What is the purpose of the “reduce” method in JavaScript?
28. What is the difference between “null” and “undefined” in JavaScript?
29. What are the different types of loops in JavaScript?
30. What is the difference between “let,” “const,” and “var” in JavaScript?
31. Explain the concept of event propagation in JavaScript.
32. What are the different ways to manipulate the DOM in JavaScript?
33. What is the purpose of the “localStorage” and “sessionStorage” objects?
34. How do you handle asynchronous operations in JavaScript?
35. What is the purpose of the “forEach” method in JavaScript?
36. What are the differences between “let” and “var” in JavaScript?
37. Explain the concept of memoization in JavaScript.
38. What is the purpose of the “splice” method in JavaScript arrays?
39. What is a generator function in JavaScript?
40. How does JavaScript handle variable scoping?
41. What is the purpose of the “split” method in JavaScript?
42. What is the difference between a deep clone and a shallow clone of an object?
43. Explain the concept of the event delegation pattern.
44. What are the differences between JavaScript’s “null” and “undefined”?
45. What is the purpose of the “arguments” object in JavaScript?
46. What are the different ways to define methods in JavaScript objects?
47. Explain the concept of memoization and its benefits.
48. What is the difference between “slice” and “splice” in JavaScript arrays?
49. What is the purpose of the “apply” and “call” methods in JavaScript?
50. Explain the concept of the event loop in JavaScript and how it handles asynchronous operations.

⌨️ Generating Relative Time in JavaScript

Displaying date or time in an appropriate format is a challenge in web development spanning decades. The solution for the same has never been this easier!

You may think why can't we implement this from scratch? But here are the challenges involved:

👉 Handling singular and plural (1 day, 2 days)

👉 Handling abbreviations (tomorrow, yesterday)

👉 And most important of all - handling localisation!

This Intl API that is baked into the browser will let you do all of the above without breaking a sweat. 😎

This API is supported in all modern browsers and does not require any plugins or libraries.

✨ Note: The numeric: auto option is the one which provides the abbreviations 'yesterday', 'tomorrow' etc

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JavaScript + React = Web Development

JavaScript + Three.js = 3D Visualization

JavaScript + Angular = Web Applications

JavaScript + Phaser = Game Development

JavaScript + Vue.js = Progressive Web Apps

JavaScript + TensorFlow.js = Machine Learning

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Web Development Mastery: From Basics to Advanced 🚀

Start with the fundamentals:
- HTML
- CSS
- JavaScript
- Responsive Design
- Basic DOM Manipulation
- Git and Version Control

You can grasp these essentials in just a week.

Once you're comfortable, dive into intermediate topics:
- AJAX
- APIs
- Frameworks like React, Angular, or Vue
- Front-end Build Tools (Webpack, Babel)
- Back-end basics with Node.js, Express, or Django

Take another week to solidify these skills.

Ready for the advanced level? Explore:
- Authentication and Authorization
- RESTful APIs
- GraphQL
- WebSockets
- Docker and Containerization
- Testing (Unit, Integration, E2E)

These advanced concepts can be mastered in a couple of weeks.

Remember, mastery comes with practice:
- Create a simple web project
- Tackle an intermediate-level project
- Challenge yourself with an advanced project involving complex features

Consistent practice is the key to becoming a web development pro.

Best platforms to learn:
- FreeCodeCamp
- Web Development Free Courses
- Web Development Roadmap
- Projects
- Bootcamp

Share your progress and learnings with others in the community. Enjoy the journey! 👩‍💻👨‍💻

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Like this post if it helps 😄❤️

ENJOY LEARNING 👍👍

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Skills to become a successful web developer💯👨🏻‍💻

1. HTML/CSS Basics 📄🎨
Master the building blocks of the web.

2. JavaScript 💻⚡
Add interactivity and dynamic content to your sites.

3. Responsive Design 📱🌍
Ensure your sites look great on all devices!

4. Version Control (Git) 🛠️🔄
Track changes and collaborate with ease.

5. Frameworks (React, Angular, etc) 🚀🛠️
Speed up development with powerful tools.

6. Backend Languages (Node.js, Python, etc)🐍💻
Handle server-side logic and databases.

7. APIs 🔗📡
Connect and integrate with other services.

8. Problem-Solving Skills 🧩🤔
Tackle challenges creatively and efficiently.

9. Testing/Debugging 🔍🐞
Ensure your code runs smoothly and bug-free.

10. Soft Skills (Communication, Teamwork) 🗣️🤝
Work effectively with others and convey ideas clearly.

11. Continuous Learning 📚✨
Stay updated with the latest technologies and trends.

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