Most common Junior JS Developer interview questions

As a junior JavaScript developer, you can expect to be asked a variety of questions during interviews, covering both technical and non-technical aspects. Here are some of the most common questions that you might encounter:

1. Basic JavaScript Concepts:

   • What is JavaScript, and what is it commonly used for?
   • Explain the difference between var, let, and const.
   • What are data types in JavaScript?
   • How do you declare and call functions in JavaScript?
   • What is the difference between null and undefined?
   • How does hoisting work in JavaScript?

2. DOM Manipulation and Events:

   • What is the DOM (Document Object Model) in the context of web development?
   • How do you access and modify elements in the DOM using JavaScript?
   • Explain event delegation and its benefits.

3. Asynchronous Programming:

   • What is asynchronous programming in JavaScript, and why is it important?
   • How do you handle asynchronous operations using callbacks, promises, or async/await?

4. Array Manipulation and Higher-Order Functions:

   • How do you loop through an array in JavaScript?
   • What are some common array methods like map, filter, and reduce, and how are they used?

5. ES6+ Features:

   • What are some new features introduced in ES6 and later versions of JavaScript?
   • How do arrow functions differ from regular functions?
   • What are template literals, and how do you use them?

6. Common Libraries and Frameworks:

   • Have you worked with any JavaScript libraries or frameworks like React, Vue, or Angular?
   • What are the advantages and disadvantages of using a framework?

7. Debugging and Tools:

   • How do you debug JavaScript code?
   • Have you used any developer tools like Chrome DevTools?

8. Testing:

   • Have you written unit tests for JavaScript code?
   • What testing frameworks have you used?

9. Code Organization and Best Practices:

   • How do you organize your JavaScript code to make it maintainable and scalable?
   • What are some best practices you follow while writing JavaScript code?

10. Project Experience:

    • Can you describe a JavaScript project you worked on?
    • What were the most significant challenges you faced during the project, and how did you overcome them?

Remember that the specific questions can vary depending on the company and the interviewer's preferences. It's crucial to review JavaScript concepts, practice coding exercises, and be prepared to discuss your own experiences and projects to demonstrate your skills and enthusiasm for the field.