Important Interview Questions to Prepare for JavaScript Developer Job

Companies around the globe have been hunting for global talent and providing remote JavaScript developer jobs. Since you’ll be competing with developers from different areas, it is obvious that the competition will not be easy. You need to have special skills and be well-prepared for your interview. How you tackle the questions will decide your fate – whether you get the job. 

If you have recently started working as a JavaScript developer, do not skip this guide and pay attention! Here we have listed the basic questions that the employer could ask you and their answers to help you out. So, without any delay, let’s begin.

Interview Questions and Answers for JavaScript Developer Jobs

It is not necessary that you’ll be asked the same questions mentioned below, but this guide is to help you get an idea of what to expect during your interview. 

What is the main difference between Java and JavaScript?

Though both programming languages are object-oriented, there are some differences between the two. The applications created on Java can run on virtual machines and browsers; however, the code only runs on the browser with JavaScript. Similarly, you’ll need to compile the codes in Java and JavaScript codes in text form.

What are the advantages and disadvantages of using JavaScript?

As a remote web developer, it is important that you are aware of the strengths and weaknesses of the languages you are using. Some of the advantages of using this programming language include:

• It is lightweight and can be executed within the user’s browsers without communicating with the server. This helps a lot in saving bandwidth.
• The programming language is versatile as it can support multiple programming models. For instance, object-oriented, functional, and imperative programming can be used for server-side and front-end technology.
• JavaScript has smooth interactivity – because you can complete the tasks within the browser without communicating with a server, which helps create a desktop-like experience for the end-users. 
• The programming language has rich interfaces that can be used to enhance the website’s UI/UX design.

These are some of the basic advantages of JavaScript. Moving on, here are some downsides of using it:

• The first weakness of this programming language is security. Learn in how many ways it can be exploited to explain your answer. 
• Secondly, it has many programming quirks that lead to inconsistent performance over different platforms.

What is the difference between classical and prototypal inheritance?

The best thing about JavaScript is that it doesn’t work on the rigid classical inheritance, but all the objects inherit property from other objects. Classical inheritance is a function that instantiates an instance with a new keyword. This new occurrence inherits all of its properties from the parent class. On the other hand, in prototypal inheritance, an occurrence happens by cloning of an existing object, considered as a prototype. 

What are the data types supported by JavaScript?

The JavaScript supports the following data types:

• Object
• Symbol
• Number
• String
• Boolean
• Undefined
• Null

Is JavaScript a case sensitive language? 

When you are applying for JavaScript developer jobs, it is important that you know the answer to this question. This programming language is case sensitive. All the variables, keywords, function names, and other identifiers must be typed consistently with capitalized letters.

What are the scopes of a variable in JavaScript?

The variable’s scope reflects the program region in which it is defined. Mainly, JavaScript variables have two scopes, including:

Global variables: This variable has a global scope, making it easily visible everywhere in your JavaScript code.

Local variable: This variable will only be visible in the function where it is defined.

What is a RESTful web service?

REST (Representational State Transfer) is an architectural style that is widely used for mobile and web applications. The RESTful services are preferred by many as they are scalable, easy to maintain, and lightweight. They are typically based on HTTP protocol and use intuitive URIs. Also, it transfers XML/JSON data between the server and user. 

Which frameworks are you most familiar with?

The companies look for talented developers familiar with more than one framework. Some of the most common ones are AngularJS, Backbone, jQuery and Meteor. If you know any of these, it will be good to share them with your employer. 

There are many other questions as well asked during the interview for JavaScript developer jobs; however, these 8 are mostly the foundation for all the other questions, so preparing them will help you out a lot. If you are looking for remote opportunities for JavaScript developers, link yourself with companies like RemoteBase to find the best options.

For more info, move on to our FAQ section.

Frequently Asked Questions

• How do I prepare for a JavaScript interview?

To get ready for your JavaScript, make sure to study properly and prepare the questions mentioned above in the guide.

• Are coding interviews hard? 

The difficulty of the coding interview is usually great as the employer will be testing your technical skills. So, make sure you properly prepare for the interview and even ask developers who have been through the same process.

• What are the interview questions asked in JavaScript?

The questions in an interview vary with each candidate, but the ones mentioned above are some basics that you should focus on preparing.