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Virtusa Software Services React Developer Interview Questions and Answers

Updated 19 Apr 2021

7 Interview questions

A React Developer was asked
Q. What are Hooks in React? Explain useState and useEffect hooks.
Ans. 

Hooks are functions that allow you to use state and other React features without writing a class.

  • useState is a hook that allows you to add state to functional components.

  • useEffect is a hook that allows you to perform side effects in functional components.

  • Hooks can only be used in functional components.

  • Hooks must be called at the top level of a functional component.

  • Hooks can be used to replace lifecycle methods in ...

A React Developer was asked
Q. What is the significance of the 'this' keyword in JS?
Ans. 

The 'this' keyword in JS refers to the object that is currently executing the code.

  • The value of 'this' depends on how a function is called.

  • In a method, 'this' refers to the object that the method belongs to.

  • In a regular function, 'this' refers to the global object (window in a browser).

  • In an event handler, 'this' refers to the element that triggered the event.

  • The value of 'this' can be explicitly set using call(),...

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A React Developer was asked
Q. How does setState work in React?
Ans. 

setState is a method used in React to update the state of a component.

  • setState is asynchronous and batched for performance optimization.

  • It merges the new state with the previous state.

  • It schedules a re-render of the component and its children.

  • Passing a function to setState ensures the previous state is used correctly.

  • Example: this.setState({ count: this.state.count + 1 })

A React Developer was asked
Q. What are export types in ReactJS?
Ans. 

Export types in ReactJS allow components, functions, and variables to be accessed and used in other files.

  • Exporting a component allows it to be imported and used in other files

  • Exporting a function allows it to be imported and used in other files

  • Exporting a variable allows it to be imported and used in other files

A React Developer was asked
Q. Features of ES6. Explain Spread Operator and Rest Parameter by writing code. Give example for Object Destructuring.
Ans. 

ES6 features: Spread Operator, Rest Parameter, Object Destructuring

  • Spread Operator: allows an iterable to be expanded into individual elements

  • Rest Parameter: allows a function to accept an indefinite number of arguments as an array

  • Object Destructuring: allows extracting properties from an object and assigning them to variables

A React Developer was asked
Q. How Promise works? What is Promise.all. Write code for both.
Ans. 

Promises are a way to handle asynchronous operations in JavaScript. Promise.all is used to execute multiple promises concurrently.

  • Promises represent a value that may not be available yet

  • They have three states: pending, fulfilled, and rejected

  • Promise.all takes an array of promises and returns a new promise that resolves when all promises in the array have resolved

  • If any promise in the array is rejected, the returne...

A React Developer was asked
Q. Write a React Class component. Convert this Class to a Functional Component. How can you pass prop from parent to child component? Write code.
Ans. 

Answer to a React Developer interview question about class and functional components and passing props.

  • Class component: class MyComponent extends React.Component {}

  • Functional component: const MyComponent = (props) => {}

  • Passing props from parent to child:

Are these interview questions helpful?

Virtusa Software Services React Developer Interview Experiences

1 interview found

I applied via Naukri.com and was interviewed in Mar 2021. There was 1 interview round.

Interview Questionnaire 

8 Questions

  • Q1. JavaScript coding questions. Reverse a string. Write a function that can find length of argument.
  • Q2. What are export types in ReactJS?
  • Ans. 

    Export types in ReactJS allow components, functions, and variables to be accessed and used in other files.

    • Exporting a component allows it to be imported and used in other files

    • Exporting a function allows it to be imported and used in other files

    • Exporting a variable allows it to be imported and used in other files

  • Answered by AI
  • Q3. What are Hooks in React? Explain useState, useEffect hooks.
  • Ans. 

    Hooks are functions that allow you to use state and other React features without writing a class.

    • useState is a hook that allows you to add state to functional components.

    • useEffect is a hook that allows you to perform side effects in functional components.

    • Hooks can only be used in functional components.

    • Hooks must be called at the top level of a functional component.

    • Hooks can be used to replace lifecycle methods in class...

  • Answered by AI
  • Q4. What is the significance of 'this' keyword in JS?
  • Ans. 

    The 'this' keyword in JS refers to the object that is currently executing the code.

    • The value of 'this' depends on how a function is called.

    • In a method, 'this' refers to the object that the method belongs to.

    • In a regular function, 'this' refers to the global object (window in a browser).

    • In an event handler, 'this' refers to the element that triggered the event.

    • The value of 'this' can be explicitly set using call(), appl...

  • Answered by AI
  • Q5. How setState works in React?
  • Ans. 

    setState is a method used in React to update the state of a component.

    • setState is asynchronous and batched for performance optimization.

    • It merges the new state with the previous state.

    • It schedules a re-render of the component and its children.

    • Passing a function to setState ensures the previous state is used correctly.

    • Example: this.setState({ count: this.state.count + 1 })

  • Answered by AI
  • Q6. Write a React Class component. Convert this Class to a Functional Component. How can you pass prop from parent to child component? Write code.
  • Ans. 

    Answer to a React Developer interview question about class and functional components and passing props.

    • Class component: class MyComponent extends React.Component {}

    • Functional component: const MyComponent = (props) => {}

    • Passing props from parent to child:

  • Answered by AI
  • Q7. How Promise works? What is Promise.all. Write code for both.
  • Ans. 

    Promises are a way to handle asynchronous operations in JavaScript. Promise.all is used to execute multiple promises concurrently.

    • Promises represent a value that may not be available yet

    • They have three states: pending, fulfilled, and rejected

    • Promise.all takes an array of promises and returns a new promise that resolves when all promises in the array have resolved

    • If any promise in the array is rejected, the returned pro...

  • Answered by AI
  • Q8. Features of ES6. Explain Spread Operator and Rest Parameter by writing code. Give example for Object Destructuring.
  • Ans. 

    ES6 features: Spread Operator, Rest Parameter, Object Destructuring

    • Spread Operator: allows an iterable to be expanded into individual elements

    • Rest Parameter: allows a function to accept an indefinite number of arguments as an array

    • Object Destructuring: allows extracting properties from an object and assigning them to variables

  • Answered by AI

Interview Preparation Tips

Interview preparation tips for other job seekers - This was a Technical First Round. Interviewer was looking for a good command in JS as well as React in terms of code skills. Be prepared with ES6 features and examples, Promises. Interviewers these days are very nice. There is nothing to be afraid of. If you don't know an answer to any question, you can say you are not sure, or can't recall. It is totally fine.

Skills evaluated in this interview

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Can speak English, can’t deliver in interviews
I feel like I can't speak fluently during interviews. I do know english well and use it daily to communicate, but the moment I'm in an interview, I just get stuck. since it's not my first language, I struggle to express what I actually feel. I know the answer in my head, but I just can’t deliver it properly at that moment. Please guide me
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Interview questions from similar companies

I applied via Company Website and was interviewed before Jun 2021. There were 2 interview rounds.

Round 1 - Aptitude Test 

First round was coding as well as aptitude done together went well I guess focusing on codes helps a lot.

Round 2 - Technical 

(1 Question)

  • Q1. 2nd round included tr and mr round went quite enegritic

Interview Preparation Tips

Interview preparation tips for other job seekers - Resume skills matters a lot don't fill resume the technologies you don't even aware of

React Developer Interview Questions Asked at Other Companies

asked in Cybage
Q1. Swap Two Numbers Problem Statement Given two integers a and b, yo ... read more
Q2. Covid Vaccination Distribution Problem As the Government ramps up ... read more
Q3. Triplets with Given Sum Problem Given an array or list ARR consis ... read more
asked in ValueLabs
Q4. How do you connect a component to Redux store? Which function in ... read more
asked in Cybage
Q5. Sort Array Problem Statement Given an array consisting of 'N' pos ... read more

I applied via Campus Placement and was interviewed in Apr 2020. There was 1 interview round.

Interview Questionnaire 

2 Questions

  • Q1. Are you willing to relocate?
  • Ans. 

    Yes, I am open to relocating for the right opportunity that aligns with my career goals and personal growth.

    • Relocation can provide exposure to new technologies and methodologies.

    • I am excited about the prospect of working in diverse teams and cultures.

    • For example, moving to a tech hub like San Francisco could enhance my career.

    • I understand the challenges of relocating, but I see them as opportunities for growth.

  • Answered by AI
  • Q2. Why should I hire you?
  • Ans. 

    I bring a unique blend of skills, experience, and passion for software development that aligns perfectly with your team's goals.

    • Proven experience in developing scalable applications, such as a recent project where I improved performance by 30%.

    • Strong problem-solving skills demonstrated through my contributions to open-source projects, enhancing functionality and fixing bugs.

    • Excellent teamwork and communication abilitie...

  • Answered by AI

Interview Preparation Tips

Interview preparation tips for other job seekers - My technical and Hr interview done at same place. It lasted about 40minutes. The interviewer test both my technical knowledge and communication skills. I tell most of the answer. They check patience level.He stressed on my final year project . Asking about range and specification of compotents which I heve used in my project. Finally ask some HR questions.

I applied via Walk-in and was interviewed before Dec 2020. There were 3 interview rounds.

Interview Questionnaire 

3 Questions

  • Q1. Basic Programming questions.
  • Q2. Fibonacci program
  • Ans. 

    A Fibonacci program generates a sequence where each number is the sum of the two preceding ones, starting from 0 and 1.

    • The Fibonacci sequence starts with 0 and 1.

    • Each subsequent number is the sum of the previous two: 0, 1, 1, 2, 3, 5, 8, 13, ...

    • Common implementations include recursive, iterative, and using dynamic programming.

    • Example of an iterative approach in Python: ```python def fibonacci(n): a, b = 0, 1 ...

  • Answered by AI
  • Q3. OOPS concepts.

Interview Preparation Tips

Interview preparation tips for other job seekers - Prepare basic OOPS concepts and basic programs.

I applied via LinkedIn and was interviewed before Jul 2021. There were 2 interview rounds.

Round 1 - Aptitude Test 

Easy logical questions
basic quant

Round 2 - Coding Test 

Easy level coding questions
Counting frequency of alphabets

Interview Preparation Tips

Interview preparation tips for other job seekers - Just go through the basics of javascript
Hoisting

Interview Questionnaire 

1 Question

  • Q1. How to use multiple dispatch in redux?
  • Ans. 

    Multiple dispatch is not a feature of Redux. It can be achieved using middleware or custom logic.

    • Middleware like redux-thunk or redux-saga can be used to dispatch multiple actions based on a single action.

    • Custom logic can be implemented in the reducer to handle multiple actions based on a single action type.

    • For example, a single 'ADD_ITEM' action can trigger multiple actions like 'UPDATE_TOTAL', 'UPDATE_HISTORY', etc.

    • M...

  • Answered by AI

Skills evaluated in this interview

I applied via Campus Placement and was interviewed before Jun 2020. There were 3 interview rounds.

Interview Questionnaire 

2 Questions

  • Q1. Simple program
  • Q2. I wrote a simple program in C

Interview Preparation Tips

Interview preparation tips for other job seekers - Be bold and confident
Are these interview questions helpful?

I applied via Naukri.com and was interviewed before Oct 2019. There were 3 interview rounds.

Interview Questionnaire 

1 Question

  • Q1. What technical challenges have you faced in your work till now and how did you overcome it?
  • Ans. 

    Faced various technical challenges, including system integration and performance optimization, which I successfully navigated through strategic solutions.

    • Integration of legacy systems with modern applications: I utilized APIs and middleware to ensure seamless data flow.

    • Performance bottlenecks in a web application: Implemented caching strategies and optimized database queries, resulting in a 40% speed increase.

    • Debugging...

  • Answered by AI

Interview Preparation Tips

Interview preparation tips for other job seekers - Be truthful and give detailed explanation of the issues and how it was resolved. Explain the severity of the problem and what blockage it had caused in your daily work. How did you chose a solution and how fast was it implemented.

I applied via Walk-in and was interviewed before Sep 2019. There were 3 interview rounds.

Interview Questionnaire 

1 Question

  • Q1. 1.Technical Ques(OOPS Concept)and 2. Area of Interest 3. About Company 4. more

Interview Preparation Tips

Interview preparation tips for other job seekers - Hello Folks,
Sharing some tips while facing Interview Assessment or GD Round Assessment.
1. Be Confident always give the answer what they ask for, Never connect your answer with different topic.
2. Always go through Company Portal or wiki about their Operation & Function.
3. Always have positive vibes that whatever yes or No, You will surely gain something.
All the Best..!!

Interview Questionnaire 

1 Question

  • Q1. All about SQL joins,data warehouse.

Interview Preparation Tips

Interview preparation tips for other job seekers - Be prepared and answer only if you know the concept clearly.

Virtusa Software Services Interview FAQs

What are the top questions asked in Virtusa Software Services React Developer interview?

Some of the top questions asked at the Virtusa Software Services React Developer interview -

  1. Write a React Class component. Convert this Class to a Functional Component. Ho...read more
  2. What are export types in React...read more
  3. What are Hooks in React? Explain useState, useEffect hoo...read more

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