Wissen Infotech Interview Questions, Process, and Tips

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?

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.
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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...read more
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Q1. Questions about project, experience etc.
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Normal aptitude test and 2 coding test

Q1. Self introduction, based on my project technical questions
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Q2. Technical questions Challenges questions
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Q1. Regarding Angular basic
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Q1. About project your role and responsibilities
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Q1. Introduction & Basic of Testing
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Q1. Introduction & Advanced questions of Testing
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Q2. Use Cases, Project Planning, Real time scenario to Handle client, Agile & Scrum
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Q1. Project Handling, New Product Validation Approach, If you are a lead how will you handle project in critical situation, Entry and Exit Criteria of testing
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