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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Q1. What is service account
Ans. 
A service account is a special account used by a service or application to access resources on a network.
• Service accounts are used to run services or applications with the necessary permissions and access rights.

• Service accounts are often used in database administration to allow the database service to interact with the operating system.

• Service accounts can be configured with specific permissions and restrictions to li...read more
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Q2. How to configure replication
Ans. 
Replication can be configured by setting up a publication, creating a subscription, and initializing the subscription.
• Set up a publication by selecting the database objects to replicate and defining the publication properties.

• Create a subscription by specifying the subscriber server, database, and synchronization schedule.

• Initialize the subscription by generating a snapshot of the publication and applying it to the sub
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Q1. What is different between truncate and delete
Ans. 
Truncate is faster and cannot be rolled back, while delete is slower and can be rolled back.
• Truncate is a DDL command, while delete is a DML command.

• Truncate removes all rows from a table, while delete removes specific rows based on a condition.

• Truncate resets identity column values, while delete does not.

• Truncate cannot be used with a WHERE clause, while delete can.

• Truncate is faster than delete as it does not log ind...read more
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Q2. Tell me about team dynamics
Ans. 
Team dynamics refer to the interactions and relationships among team members that impact team performance and effectiveness.
• Effective communication is key for successful team dynamics

• Establishing clear roles and responsibilities helps avoid conflicts

• Encouraging collaboration and mutual respect fosters a positive team environment
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Q1. Basics questions of PV
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Q2. What is ADR, difference between ADE and ADR
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All maths questions and coding questions

Array problems, agular basic, JS snippets