10+ Interview Questions and Answers

The starting point of a .NET Core application is the Main method.

• The Main method is the entry point of a .NET Core application.

• It is typically located in the Program class.

• The Main method is responsible for configuring and building the application's host.

• It also sets up the application's services and runs the application.

• Here's an example of a Main method in a .NET Core application: public static void Main(string[] args) { CreateHostBuilder(args).Build().Run(); }

• The CreateHos...read more

An interface defines a contract for classes to implement, while an abstract class provides a partial implementation.

• An interface can only have abstract methods, while an abstract class can have both abstract and non-abstract methods.

• A class can implement multiple interfaces, but can only inherit from a single abstract class.

• Interfaces are used to achieve multiple inheritance in Java.

• Abstract classes can have instance variables, constructors, and static methods, while interfac...read more

Primary key uniquely identifies each record in a table, foreign key establishes a link between two tables, unique key ensures uniqueness of values in a column.

• Primary key: uniquely identifies each record in a table, must be unique and not null.

• Foreign key: establishes a link between two tables, ensures referential integrity.

• Unique key: ensures uniqueness of values in a column, allows null values but only one null per column.

Generics in C# allow the creation of reusable code by providing a way to define classes, interfaces, and methods that can work with any data type.

• Generics enable type safety and eliminate the need for casting.

• They improve code reusability and performance.

• Example: List is a generic class that can hold a list of strings.

• Generics can be used with classes, interfaces, methods, delegates, and more.

Middleware is software that acts as a bridge between different applications or components, enabling communication and data exchange.

• Middleware facilitates communication between software components

• It acts as a bridge between applications or services

• Middleware enables data exchange and integration

• Examples of middleware include message queues, API gateways, and web servers

Directives are a feature in software development frameworks that allow developers to extend or modify the behavior of HTML elements.

• Directives are used in frameworks like Angular and Vue.js.

• They are used to create reusable components or add custom functionality to existing elements.

• Directives can be used to manipulate the DOM, handle events, perform data binding, and more.

MVC architecture is a software design pattern that separates an application into three main components: Model, View, and Controller.

• Model represents the data and business logic of the application

• View is responsible for displaying the data to the user

• Controller acts as an intermediary between Model and View, handling user input and updating the Model accordingly

• Promotes code reusability, modularity, and easier maintenance

• Examples: ASP.NET MVC, Ruby on Rails, Spring MVC

Event Loop in Node.js is a mechanism that allows Node.js to perform non-blocking I/O operations by offloading tasks to the operating system.

• Event Loop is a single-threaded mechanism that handles asynchronous operations in Node.js.

• It allows Node.js to perform I/O operations without blocking the execution of other code.

• Event Loop continuously checks the event queue for new events and executes them in a loop.

• Example: setTimeout() function in Node.js uses Event Loop to schedule t...read more

Node.js is single threaded to optimize performance by avoiding the overhead of managing multiple threads.

• Node.js uses an event-driven, non-blocking I/O model which allows it to handle multiple requests efficiently on a single thread.

• This design choice helps in avoiding the overhead of creating and managing multiple threads, leading to better performance.

• Node.js leverages the underlying libuv library to handle asynchronous operations, making it single threaded.

Angular lifecycle hooks are methods that allow you to tap into specific moments in the lifecycle of a component or directive.

• ngOnInit() - called after the component is initialized

• ngOnChanges() - called when the component's input properties change

• ngDoCheck() - called during every change detection run

• ngAfterContentInit() - called after content is projected into the component

• ngAfterContentChecked() - called after every check of projected content

• ngAfterViewInit() - called after t...read more

Angular has several types of pipes that can be used for data transformation and formatting.

• Angular provides built-in pipes like 'date', 'uppercase', 'lowercase', 'currency', etc.

• Custom pipes can be created for specific data transformations.

• Pipes can be used in template expressions to modify data before displaying it.

• Pipes can also be chained together for multiple transformations.

• Example: {{ myDate | date: 'short' | uppercase }} will display a short formatted date in uppercase...read more