Latest JavaScript Interview Questions

Latest JavaScript Interview Questions

Table of Contents

Hiring in any other field is a bit easier than software. The person should know all the tools and software the company is practising. They should be up-to-date and familiar with most of the software. 

Hiring a software developer is a pain in the head. So to pass this problematic interview, here are a few questions and answers you must keep in mind to fly off with the offer letter.

Key Takeaways

  • Meaning of Java
  • Meaning of JavaScript
  • Fresher Level Software Development Interview Q&A.
  • JavaScript Interview Questions for 2 Years’ Experience.
  • Some of the Exclusive JavaScript Interview Questions with Answers.

But, before going in-depth with all the interview questions, I want you to know the meaning of Java and JavaScript.

What is Java?

Java is a programming language and a software platform that runs billions of devices like smartphones,  computers,  gaming laptops, medical & food devices, and many more. The rules and syntax are based on C and C++  languages.

So, I hope you have clearly understood the meaning of Java. Now, let me tell you about javascript.

What is JavaScript?

JavaScript is a text-based programming language that can be used both on the client and server sides, making web pages interactive. JS, HTML, and CSS languages also structure and style web pages.

Here are a few JavaScript Interview Questions for Freshers.

 JavaScript Interview Questions for Freshers

1. List down two principle programming paradigms for JavaScript development.

I am going to list down all the main paradigms so that you will be able to remember any two of these.

2. What are the different data types in js?

There are many data types of operators, so let me provide you the sub-types with primary data.

1. Primitive type

String – It uses quotes and portrays several different people. A single or double quote can be used to denote a string.

Example – 

var str = “Ananth S Giri”; //using double quotes

var str2 = ‘Ananth’ ; //using single quotes


It can be expressed with or without decimal and represents a number.

Example –

var x = 3;//without decimal

var y = 3.6;//with decimal

In the primitive type, there are 7, and the above 2 are the most important ones. The rest are as follows,

  • BigInt
  • Boolean
  • Undefined
  • Null
  • Symbol

2. Non-primitive types

Only one value can be stored in primitive data types. Non-primitive input parameters are used to store many complicated values. Objects are used to hold a group of data.

// Collection of data in key-value pairs

var obj1 = {

   x:  44,

   y:  “You are welcome!”,

   z: function(){

      return this.x;



// Collection of data as an ordered list

var array1 = [5, “You”, true, 4.1]; 

3. What is hoisting in JavaScript?

The way that JavaScript operates by default is called hoisting, and all object and procedure declarations are stacked on top of one another.

The indication of objects and procedures is shifted to the top of the scope regardless of where they are declared.

4. What is the significance of the term “debugger” in JavaScript?

To debug the code, the browser’s debugger must be turned on. Built-in debuggers can be activated and deactivated, and they need the users to report errors. While debugging, the remainder of the software should halt before continuing to the following line.

5. What is the difference between “===” and “==”?

“===” – compares both values and types.

“==” – Only compares values.

Here are a few crucial JavaScript interview questions for people with a minimum experience of 2 years.

Must Read: 10 Must-Read Books On Web Development

6. JavaScript Interview Questions for 2 Years Experience

Few below answers to the questions are only suggestions. Try not to answer the same in the interview but be similar.

7. What exactly do you know about JS?

JS is an object-based programming language that has a lot of applications. This programming language can be used both on the client and server sides. 

(Now mention the things you have learnt and worked on – Give a summary of the projects you have performed in the previous company.)

8. Let’s say that you are on the client’s machine. How will you detect the server using JavaScript?

For these tasks, you need the Navigator App. The string performs the required task automatically and defines the work. Some instructions are to be followed and executed at the right time. Sometimes you need to mention the IP address to detect the server.

9. What is the fundamental distinction between Java and JavaScript?

These phrases can be distinguished from one another by a few key differences. JavaScript is a modified or written version typically used in HTML pages. Whereas, Java is a well-known programming language employed to create apps in practically every category. 

These two languages are independent of one another and have different applications. Java is typically seen as an OOPs (Object Oriented Programming)language, whereas clients prefer JavaScript as a scripting language. 

Additionally, JavaScript is widely utilised in HTML Web pages, whereas Java is primarily used to create computer programs.

10. How can you break the JavaScript code into different lines?

The aid of a backlash will enable this. However, you must apply it toward the bottom of the first line; otherwise, an error message will appear. 

The good news is that there is no restriction on the number of lines that may be added to accommodate data. Additionally, carrying out this task is not difficult and can be done by anyone.

11. What does JavaScript’s strict equality operator mean?

The existence of an issue or condition where more than one component has comparable values frequently occurs throughout the code. The rigorous equality operator can return the operand’s actual value without pausing the process.

Here is an exclusive interview question to which you need to know the answers!

Unknown JavaScript Interview Question

1. What are the seven JavaScript concepts every expert programmer should know?

Many concepts are confusing and difficult to understand, but a good knowledge of these concepts can help you in the long run. Here are a few concepts you would like to learn more about or research to provide the best answers.

  • Scope
  • Immediately invoked function expression
  • Hoisting
  • Closure
  • Callbacks
  • Promises
  • Async & Await

Also Read: 8 Most Important Interview Tips And Tricks To Follow


Don’t be afraid of the interview as it will be practical based. Concentrate on all the JavaScript concepts and understand them with example. The above-mentioned are some of the critical questions that are to be kept in mind during the time of the interview.

Frequently Asked Questions (FAQs)

Which interview questions for JavaScript are there?

Here are some JavaScript interview questions and responses for both new and seasoned candidates looking to land their ideal position.
1. JavaScript: What is it? 
2. Which distinctions between Java and JavaScript are there? 
3. What are the Data Types in JavaScript?
4. What does the isNaN function do? 
5. Which is quicker, an ASP script or JavaScript?

What does JavaScript’s ES6 mean?

ECMAScript 6 is referred to as ES6. ES6 is the sixth version of ECMAScript, which was released in 2015 and is sometimes known as ECMAScript 2015. ECMAScript was developed to standardise JavaScript.

What should I study for the JavaScript interview?

1. Know what you need to study as a first step. You already know the programming language you’ll be employing, so
you just need to find out which features of it will be assessed.
2. Prepare a plan in step two.
3. Don’t overlook the behavioural interview in step three.

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