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Google JavaScript Interview Questions You Should Prepare

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Developed by Netscape, JavaScript or JS is a lightweight, interpreted scripting language. It’s at the core of the World Wide Web, and over 97% of websites use it on the client-side to program web browsers and servers. Benefits include controlling webpage behavior and dynamically updating webpage contents. Given the popularity and importance of JavaScript, expect high-quality JavaScript interview questions in your Google interview.

If you are preparing for a tech interview, check out our technical interview checklist, interview questions page, and salary negotiation ebook to get interview-ready! Also, read Amazon Coding Interview Questions, Facebook Coding Interview Questions, and Google Coding Interview Questions for specific insights and guidance on Google JavaScript tech interviews.

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This article focuses on Google JavaScript interview questions to help you prepare for your next JavaScript interview at Google. Read ahead to learn more!

In this article, we’ll cover:

  • Sample Google JavaScript Interview Questions and Answers
  • Sample Google JavaScript Interview Questions for Practice
  • Google JavaScript Interview Questions for Experienced Professionals
  • JavaScript Coding Interview Questions for Google Interview Preparation
  • How to Prepare for the Google Interview?
  • FAQs on Google JavaScript Interview Questions

Sample Google JavaScript Interview Questions and Answers

We’ll begin with some sample Google JavaScript interview questions and answers to get a basic idea of what to expect.

Q1. State the key difference between internal and external JavaScript. 

JavaScript code in internal JS is placed in an HTML page's head and body section. In external JS, JavaScript code is stored in a separate external file. 

Q2. What are the advantages of using External JavaScript?

Some advantages of external JS include increased performance, code separation, and maintainability.

Q3. List the main features of JavaScript and name the data types it supports.

The main features of JavaScript are its lightweight, interpreted, open, cross-platform, network-centric nature as a scripting language integrated with Java. JavaScript is also case-sensitive. String, symbol, number, object, undefined, null, and boolean are the data types supported by JavaScript.

Q4. What is the purpose of the ‘This’ in JavaScript?

‘This’ refers to the object it belongs to. The value of this is different depending on where we use it. This refers to the owner object in a method and the global object in a function.

Q5.Is it possible to assign an anonymous function to a variable? Can we pass it as an argument to another function?

Yes, assigning an anonymous function to a variable and passing it as an argument to another function is possible.

Learn How to Solve the Most Asked Whiteboard Interview Questions at Google to crack your interview.

Sample Google JavaScript Interview Questions for Practice

Here are some Google JavaScript interview questions. Ensure you can solve them before your interview:

  1. What are Anonymous functions in JavaScript?
  2. Which data types does JavaScript support?
  3. What is “this” in JavaScript?
  4. What is JavaScript Hoisting?
  5. What is null in JavaScript?
  6. Name the unique types of Error Name Values in JavaScript.
  7. Why is JavaScript called a loosely typed or dynamic language?
  8. How would you determine the data type an operand belongs to?
  9. Explain Self Invoking Functions in JavaScript with an example. What is their syntax?
  10. Explain Strict Mode in JavaScript and its characteristics.
  11. Describe the usage of a debugger in JavaScript code.
  12. What is a ternary operator in JavaScript?
  13. What is NaN in JavaScript?
  14. How many ways can a JavaScript code be involved in an HTML file?

Take a look at some more Google Software Engineer Interview Questions here.

Google JavaScript Interview Questions for Experienced Professionals

Let’s move a step further with some Google JavaScript interview questions for experienced professionals:

  1. How would you handle a large number of choices for one condition effectively?
  2. What type of errors does JavaScript have?
  3. Differentiate between == and ===.
  4. How would you join array items into a string?
  5. Are Java and JavaScript similar? If not, then Differentiate between Java & JavaScript?
  6. What are the advantages of JavaScript?
  7. Have you used any browser for debugging? If yes, how is it done?
  8. How would you split a string into array items?
  9. Show JavaScript Hoisting through an example.
  10. Differentiate between ‘function declaration’ and ‘function expression’?
  11. Differentiate between ‘null’ and ‘undefined’?
  12. Show the difference between test() and exec() methods through an example.
  13. What is the difference between Local storage & Session storage?
  14. Differentiate between let and const.
  15. Define and describe the usage of Closure.
  16. What is settimeout()?
  17. Differentiate between test () and exec () methods?
  18. How will you perform it if you need to hide the JavaScript code from the older browser versions?
  19. What is the difference between Call & Apply?
  20. How would you empty an Array in JavaScript? Several methods.
  21. Differentiate between var and let.

Here are the top 25+ Google Systems Design Interview Questions for Software Developers you can prepare.

JavaScript Coding Interview Questions for Google Interview Preparation

Lastly, here are some technical Google JavaScript interview questions. Ensure you can solve them before your interview:

  1. Write a simple function in < 160 chars that returns a boolean indicating whether a string is a palindrome.
  2. In JavaScript, how would you convert the string of any base to an integer?
  3. What is a possible drawback of using typeof bar === "object" to see if a bar is an object? How can we avoid this drawback?
  4. What is the significance/benefit of including 'use strict' at a JavaScript source file’s beginning?
  5. How would you add an element at the beginning and end of an array?
  6. Describe NaN and its type, and give a reliable test to see if a value is equal to NaN.
  7. List out ways to access an HTML element in JavaScript code.
  8. What is the difference between the operators ‘==‘ & ‘===‘?
  9. What would be the result of 2+5+”3″?
  10. How do you clone an object?
  11. State the value of typeof undefined == typeof NULL.
  12. Talk about the significance and reason behind wrapping the content of a JavaScript source file in a function block.
  13. Write a function isInteger(x) in several ways that check if x is an integer.

Learn How to Prepare for the Google Coding Challenge with some quick tips.

How to Prepare for the Google Interview?

We’ll leave you with some preparation tips to ace your next Google interview:

  • Start by learning about the Google interview process to see what they’re looking for and what they value.
  • Design your plan based on your starting point, how much time you have, and the areas that require most of your attention. 
  • Be good at at least one object-oriented programming language. Practice topic-wise and past interview coding questions in the OOP language you choose. You can also enroll in coding interview preparation courses to cack your tech interview.
  • Have a true understanding of the working and time and space complexities of different algorithms.
  • Understand OS concepts like concurrency, processes, and threads.
  • Take mock interviews and solve past interview questions within a time limit. Explain your thought process to friends to refine and build confidence in tech communication.

We hope that this Google JavaScript interview questions list will help you crack your tech interview. If you want to learn how to prepare for a Google interview, practice some mock interviews and read our guide to 12 key preparation tips to crack an interview.

FAQs on Google JavaScript Interview Questions

Q1. Why is JavaScript used?

Programmers use JavaScript to create dynamic and interactive web content, applications, and browsers. JavaScript is globally the most used programming language, used as a client-side programming language by 97.0% of all websites.

Q2. Is JavaScript synchronous or asynchronous?

JavaScript is a non-blocking, concurrent programming language that’s single-threaded and asynchronous at the same time!

Q3. Can I use JavaScript for interviews?

Yes, as long as that’s the language you know best, you can usually use it. Note, however, that if interviewers want to check your skill in a particular language, that changes. If the solution is much better in a different OOP language, you should have a good reason not to choose it.

Q4. Is JavaScript a case-sensitive language?

Answer: Yes, JavaScript is a case-sensitive language. The uppercase or lower-case letters must be consistent.

Q5. What does NaN mean in JavaScript?

NaN or Not-A-Number is a variable in the global scope and property of the global object. NaN has the initial value Not-A-Number and is a non-configurable and non-writable property in modern browsers.

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