Software Engi Interview Questions and Answers

Singleton pattern ensures a class has only one instance created at runtime.

• Ensures there is only one instance of the class by providing a global point of access to it.

• Uses a private constructor to restrict instantiation of the class from other classes.

• Commonly used in scenarios where only one instance of a class is needed, such as database connections or configuration settings.

useState manages state in functional components; useEffect handles side effects like data fetching.

• useState: A Hook that allows you to add state to functional components. Example: const [count, setCount] = useState(0);

• useEffect: A Hook that lets you perform side effects in function components. Example: useEffect(() => { fetchData(); }, []);

• useState returns an array with the current state and a function to update it.

• useEffect can take a dependency array to control when the eff...read more

OOPS principle stands for Object-Oriented Programming principles, which are a set of programming guidelines to help organize code and improve software design.

• Encapsulation: Bundling data and methods that operate on the data into a single unit (class).

• Inheritance: Allowing a class to inherit properties and behavior from another class.

• Polymorphism: The ability for objects of different classes to respond to the same message in different ways.

• Abstraction: Hiding the complex imple...read more

A singleton is a design pattern that restricts the instantiation of a class to one object.

• Singleton pattern ensures that a class has only one instance and provides a global point of access to it.

• Commonly used in scenarios where only a single instance of a class is needed, such as database connections or configuration settings.

• Implementation can involve a private constructor, a static method to access the instance, and a static variable to hold the instance.

• Example: Singleton ...read more

OOP in C# is a programming paradigm that uses classes and objects to model real-world entities.

• OOP stands for Object-Oriented Programming

• In C#, classes are used to define objects which have properties and methods

• Encapsulation, inheritance, and polymorphism are key principles of OOP in C#

• Example: class Car { string make; int year; void Start() { } }