Virtusa Software Services Interview Questions and Answers

Q1. Explain list view builder
Ans. 
ListView.builder creates a scrollable list of items in Flutter, optimizing performance for large datasets.
• Efficiently builds items on demand, reducing memory usage.

• Uses an indexed builder function to create widgets as they scroll into view.

• Ideal for long lists, such as displaying a large number of contacts or messages.

• Example: ListView.builder(itemCount: 100, itemBuilder: (context, index) => Text('Item $index'))
Answered by AI
Add your answer
Q2. Explain singelton
Ans. 
A singleton is a design pattern that restricts a class to a single instance and provides a global point of access to it.
• Ensures only one instance of a class exists throughout the application.

• Provides a global access point to that instance.

• Commonly used in logging, configuration settings, and thread pools.

• Example in Java: public class Singleton { private static Singleton instance; private Singleton() {} public static Si...read more
Answered by AI
Add your answer
Q3. Explain unit testing in flutter
Ans. 
Unit testing in Flutter ensures individual components work correctly, improving code quality and reliability.
• Unit tests verify the functionality of a single function or class.

• Flutter uses the 'test' package for writing unit tests.

• Example: Testing a function that adds two numbers can be done using 'test('adds two numbers', () { expect(add(2, 3), 5); });'

• Unit tests can be run using the command 'flutter test'.

• Good unit te...read more
Answered by AI
Add your answer

Q1. DB2 related questions
Add your answer

Q1. Client JPMC will conduct the technical round with some DB2 related questions
Add your answer

Q1. Salary duscussion
Add your answer

Q1. Basic questions on dotnet core
Add your answer
Q2. Basic questions on angular
Add your answer

MCQ asked for css,js etx

Q1. What are declarative rules?
Ans. 
Declarative rules are statements that define the desired outcome without specifying the steps to achieve it.
• Declarative rules focus on what needs to be done rather than how to do it

• They are commonly used in programming languages like SQL and Prolog

• Example: SQL SELECT statement specifies what data to retrieve without specifying how to retrieve it
Answered by AI
Add your answer