Pentair Interview Questions and Answers

Q1. What is real dom and virtual dom in react
Ans. 
Real DOM is the actual representation of the HTML structure, while Virtual DOM is a lightweight copy used for efficient updates.
• Real DOM is slower as it directly manipulates the HTML structure.

• Virtual DOM is faster as it updates the lightweight copy and then syncs with the real DOM.

• React uses the Virtual DOM to minimize unnecessary re-rendering of components.

• Virtual DOM allows for efficient batch updates, improving per...read more
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There were 6 questions to be solved. 3 average and 3 tough questions.

Q1. Concepts ask in interview Java Threads Exception Collections Spring boot annotations Git
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Q1. A general conversations, regarding my experience, project.
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Q1. Write unit testing for adding two nimbers
Ans. 
Unit testing for adding two numbers
• Create a test case with two numbers and expected sum

• Call the function that adds two numbers

• Assert that the result matches the expected sum
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Q1. Explain challenge you faced in your last project
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Q1. Salary expectations
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Q1. Details of OoPs concept.
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Q2. Write a program using OoPs concept
Ans. 
Program using OOPs concept
• Identify the objects and their properties

• Create classes and define their methods

• Use inheritance and polymorphism

• Encapsulate data and use access modifiers

• Example: A program to simulate a bank account
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Q3. How do code review in your project
Ans. 
Code reviews are conducted regularly to ensure code quality and adherence to coding standards.
• Code reviews are conducted by peers or senior developers.

• Reviewers check for code quality, readability, maintainability, and adherence to coding standards.

• Issues found during code review are documented and addressed by the developer.

• Code reviews are conducted regularly, either before merging code or on a scheduled basis.

• Tools ...read more
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One programming challange just to see how good you use OOPs