100+ Wissen Infotech Interview Questions & Answers | Complete Prep Guide 2025

Wissen Infotech Interview Experiences

Popular Designations

44 interviews found

React Developer Interview Questions & Answers

Anonymous

posted on 16 Sep 2022

I applied via Naukri.com and was interviewed in Aug 2022. There were 3 interview rounds.

Round 1 - Coding Test

There was a test with JS and React MCQs. Plus subjective questions which are these.
1. Write a function that keep track of how many times it is called
2. What are Sass, Less, Postcss and Stylus? Why do people use them?
3. What is CSS flexbox? Explain with a simple example.
4. What is the difference between RequireJS, CommonJS and AMD Loaders?
5. Write a function that flattens an array of nested arrays into a single array.
6. What is Callback Hell? How do you avoid it?

Round 2 - Technical

(2 Questions)

Q1. What is React? Why do we use it? Make a form with 3 different child components and pass props from the parent. There should be Select box, an Input field and a Submit Button.

Ans.

React is a JavaScript library used for building user interfaces.

React allows for reusable components and efficient rendering.
It uses a virtual DOM to update only the necessary parts of the UI.
React is popular for its simplicity and flexibility.
Examples of companies using React include Facebook, Instagram, and Airbnb.

Answered by AI

View 1 more answer

Q2. What is Virtual DOM?

Ans.

Virtual DOM is a lightweight copy of the actual DOM that React uses to update the UI efficiently.

Virtual DOM is a JavaScript object that represents the actual DOM.
It allows React to update only the necessary parts of the UI, improving performance.
Changes made to the Virtual DOM are compared with the previous version to determine the minimum number of changes needed to update the actual DOM.
React uses a diffing algorith...

Answered by AI

Add your answer

Round 3 - Technical

(1 Question)

Q1. Questions about project, experience etc.

Add your answer

Interview Preparation Tips

Interview preparation tips for other job seekers - I'd say avoid this company. The interviewers are egoistic and rigid.

Skills evaluated in this interview

React Developer Interview Questions asked at other Companies

Q1. Swap Two Numbers Problem Statement Given two integers a and b, your task is to swap these numbers and output the swapped values. Input: The first line contains a single integer 't', representing the number of test cases.Each subsequent line... read more

View answer (1)

HCLTech

A more secure future awaits you

Find your spark and supercharge your own potential

Engineer Trainee Interview Questions & Answers

Anonymous

posted on 10 Dec 2022

I applied via Referral and was interviewed in Jun 2022. There were 3 interview rounds.

Round 1 - Resume Shortlist

Pro Tip by AmbitionBox:

Keep your resume crisp and to the point. A recruiter looks at your resume for an average of 6 seconds, make sure to leave the best impression.

View all Resume tips

Round 2 - Aptitude Test

Normal aptitude test and 2 coding test

Round 3 - Technical