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JavaScript Interview Questions

JavaScript Interview Questions

Interviews for IT jobs including JavaScript jobs often include challenges far beyond the usual questions regarding career aspirations.

IT job interviews often consist of brainteasers, riddles and practical questions designed to measure your logic, reasoning, creative thinking, and problem-solving skills. The objective for the interviewer is not only to assess your technical knowledge, but also your communication skills and suitability (culturally) for the company.

Here are some example JavaScript job interview questions to help you to prepare yourself (answers can be found at the bottom of the page):

JavaScript interview questions

  1. What’s relationship between JavaScript and ECMAScript?
  2. How do you convert numbers between different bases in JavaScript?
  3. What is negative infinity?
  4. What does "1"+2+4 evaluate to?
  5. How about 2+5+"8"?
  6. How do you create a new object in JavaScript?
  7. What’s a way to append a value to an array?
  8. What are JavaScript types?
  9. What does isNaN function do?
  10. What boolean operators does JavaScript support?

Click here to view answers

It is important at JavaScript job interviews to be specific when answering questions. Concise qualitative answers demonstrate confidence and knowledge.

For more advice on perfecting your interview technique, we've partnered up with CV Knowhow who offer interview coaching so click here to find out more.

Good Luck!