Basic Interview Questions for Front-End Developers in India

20 April 2021
Every web page or application has two phases- the primary function, which forms the backend, and the user side, which is the front- end. In this I.T. scenario, more importance is being given to the front- end development since this particular field drives traffic to the website and increases the user experience. That's the reason why a career choice as a front- end developer will be very much lucrative for your future.
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Every web page or application has two phases- the primary function, which forms the backend, and the user side, which is the front- end. In this I.T. scenario, more importance is being given to the front- end development since this particular field drives traffic to the website and increases the user experience. That’s the reason why a career choice as a front- end developer will be very much lucrative for your future.

For the front- end development, the three most essential topics on which the interviews are based involve javascript, CSS, and HTML. Using these three technologies and their subsidiaries, a front- end developer can design the web page functionalities and styles on the client-side. This is why you need to know the basics of these three technologies and all other aspects in detail so that on being asked a question, you wouldn’t hesitate to answer.

This article will discuss the most common basic front- end development questions that will help you crack the first rounds of personal interviews.

Top Basic Interview Questions for Back-End Developer

This is our list of the basic interview questions for back-end developers, including the reason why the question is important as well as the ideal answer the interviewers expect from you, the candidate:

Q 1 – What is Sass?

Out of several CSS preprocessors, it is Sass which has become more popular for front-end development. Sass stands for Syntactically Awesome Stylesheet, which is used to avoid the repetitive codes in CSS and also to extend the latter in many applications. A typical Sass styling example looks like this:

/* define variables for the primary colours */

$primary_1: #a2b9bc;

$primary_2: #b2ad7f;

$primary_3: #878f99;

/* use the variables */

.main-header {

  background-color: $primary_1;

}

.menu-left {

  background-color: $primary_2;

}

.menu-right {

  background-color: $primary_3;

}

Q 2 – What do you know about React JS?

React.JS is a subsidiary open-source platform based on JavaScript frameworks, which is why many front- end applications can be easily made with React.JS. This platform was created by Facebook and is a library for the user interface. Any U.I. components can be efficiently designed using this platform without any hassle.

front-end

Following is an example of a React program written in HTML code.

<!DOCTYPE html>

<html lang="en">

<title>Test React</title>

<!-- Load React API -->

<script src= "https://unpkg.com/[email protected]/umd/react.production.min.js"></script>

<!-- Load React DOM-->

<script src= "https://unpkg.com/[email protected]/umd/react-dom.production.min.js"></script>

<!-- Load Babel Compiler -->

<script src="https://unpkg.com/[email protected]/babel.min.js"></script>

<body>

<script type="text/babel">

    //  JSX Babel code goes here

</script>

</body>

</html>

Q 3 – How are REST web services beneficial?

Most developers use the REST web services to fasten the development and reduce repeated actions for completing a particular procedure. Here are some of the benefits of using the REST technology.

· REST is based on HTTP protocols, and hence learning the technology is very easy. One won’t have to work hard to try and grasp the concepts of REST.

· There will be no connection or contract between the client and the server, not directly because REST uses APIs, making the work smoother and faster.

· Several structures are supported by the REST technology like jpg, JSON, images, XML codes, etc.

Q 4 – What is load balancing?

Just like in normal life, the concept of load balancing is applied to ensure that all the requests generated at a time can be divided equally amongst all the machines present in a particular cluster or network. With this, the workload on one machine can be reduced, and hence you can increase the performance, productivity, and speed. With load balancing technology, developers can easily manage the bugs and errors since no machine will be underloaded or overloaded with all the requests. This is one of the most effective technologies used by front- end developers to manage different systems simultaneously and the incoming traffic interactions.

Q 5 – Explain the principles of SOLID.

Front- end development mainly revolves around object- oriented designing, which is why S.O.L.I.D.’s principles are followed closely. Here is a brief description of these principles, which are the main backbone of any user- oriented front- end development.

· S: This defines the Single Responsibility Principle, which states that whatever classes will be defined must handle individual and specific responsibility. According to this principle, a level will be entitled to one duty.

· O: This describes the Open- Closed Principle, which explains that for extensions, an object can be opened or instantiated. But, on adjustments, the object should be closed.

· L: This letter describes the Liskov Substitution Principle. According to this, if q(x) is provable about x number of objects of type T, then q(y) must verify for S type objects of y such that S is a subtype of T.

· I: Interface Segregation Principle is defined by the letter I where an interface must not be used by a customer on which the user is not enforcing by any means.

· D: This is the last principle of the Dependency Inversion Principle, which entitles all the entities to be abstracted. Any high-level unit should be based on abstractions rather than low- level units or modules. 

Q 6 – What do you mean by user-centred design?

From the name itself, it’s clear that a user-centred design focuses on understanding and surveying the end-user requirements and then implementing them to enhance the web page or application performance. This kind of development concentrates entirely on the user requirements, and hence along with front- end development, several analytical methods are also implemented to understand the current market situation.

Q 7 – Explain ClickJacking.

ClickJacking is a security issue where the HTML frames can be used to fool the end-users. These frames are designed in a way where the user thinks that they are clicking a button for a specific operation. But, that user interface design is a façade or a mask as, in reality, the user is clicking on something else which might or might not involve a different functionality. Another name for ClickJacking is interfaced redressing. The developers redress the user interface platform to hide the platform’s original action and seamlessly integrate with the end-users.

Q 8 – Is jQuery ideal for front- end development?

Yes, using jQuery is highly beneficial as it has many benefits for front- end developers.

· Several built- in approaches are present in the platform.

· It’s effortless to use and integrate with the concerned web page or application.

· Methods are present by which you can apply or change the CSS codes and create simulations.

· An expandable feature is present in the jQuery platform.

· If the requirement is based on D.O.M. manipulation and traversal, using jQuery will be ideal.

· It can support AJAX development and implementations.

· Events can be detected and handled efficiently.

Conclusion

Cracking the interviews will always depend on how confidently you have answered and whether your knowledge about the topics being asked is clear or not. You wouldn’t know whether the interviewer will ask only the basic programming questions or pick topics from the front- end development technologies. This is why preparing the basics at least will give you an upper hand for the upcoming interview.

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