QualityKiosk Technologies Interview Questions and Answers

Developed a web application for a retail company to manage their inventory and sales.

• Used React.js for the front-end and Node.js for the back-end

• Implemented a database schema using MongoDB

• Integrated Stripe API for payment processing

• Implemented user authentication and authorization using JWT

• Optimized application performance by implementing caching and lazy loading

ref is used for passing reference types by reference, out is used for returning values by reference.

• Use ref when you want to modify the value of the parameter inside the method

• Use out when you want to return multiple values from a method

• ref requires the variable to be initialized before passing it to the method, out does not

• ref can be used with both value and reference types, out can only be used with reference types

Authentication is the process of verifying the identity of a user, while authorization is the process of granting access to specific resources.

• Authentication confirms the user's identity through credentials such as username and password.

• Authorization determines what resources the user can access based on their role or permissions.

• Authentication precedes authorization in the security process.

• Examples of authentication include login screens and biometric scans, while examples o...read more

Index in SQL Server is used to improve query performance. There are different types of indexes.

• Clustered index: sorts and stores data rows in the table based on their key values

• Non-clustered index: contains a separate structure with the indexed columns and a pointer to the data rows

• Unique index: ensures that the indexed columns contain unique values

• Filtered index: indexes a subset of data rows based on a filter predicate

• Full-text index: enables full-text search on character-b...read more

Middleware in .NET Core is a pipeline of components that handle requests and responses.

• Middleware is added to the pipeline using the Use() method in Startup.cs

• Middleware can modify the request or response, or pass it on to the next component in the pipeline

• Examples of middleware include authentication, logging, and error handling

Constructors are special methods used to initialize objects in a class.

• Default constructor: no arguments

• Parameterized constructor: one or more arguments

• Copy constructor: creates a new object as a copy of an existing object

• Static constructor: initializes static variables

• Private constructor: restricts object creation outside the class