Support Sages Interview Questions and Answers for Experienced

React is a JavaScript library for building user interfaces.

• React is used for creating reusable UI components.

• It uses a virtual DOM for efficient rendering.

• React allows for declarative programming.

• It was developed by Facebook and is open source.

• React Native is a framework for building mobile apps using React.

Hooks are a feature in React that allow you to use state and other React features in functional components. Redux is a state management library for JavaScript applications.

• Hooks are functions that let you use React state and lifecycle features in functional components.

• Hooks provide a way to reuse stateful logic between components.

• Redux is a predictable state container for JavaScript apps.

• Redux helps manage the state of...read more

Class components are ES6 classes that extend the React.Component class, while functional components are just plain JavaScript functions.

• Class components are more feature-rich and have access to lifecycle methods.

• Functional components are simpler and easier to read and test.

• Class components can have state and use lifecycle methods like componentDidMount and componentDidUpdate.

• Functional components are stateless and do n...read more

ES5 is the older version of JavaScript, while ES6 is the newer version with added features and syntax improvements.

• ES6 introduced let and const for variable declaration.

• ES6 introduced arrow functions for shorter syntax.

• ES6 introduced classes for object-oriented programming.

• ES6 introduced template literals for easier string interpolation.

• ES6 introduced destructuring assignment for extracting values from objects and arra...read more

Authentication in .NET involves using various authentication mechanisms such as Forms Authentication, Windows Authentication, and OAuth.

• Use Forms Authentication for web applications

• Use Windows Authentication for intranet applications

• Use OAuth for third-party authentication

• Implement authentication using ASP.NET Identity

• Use secure password storage mechanisms such as hashing and salting

Dependency injection is a design pattern where an object's dependencies are provided externally rather than created internally.

• Dependency injection helps to decouple components and make them more modular.

• It allows for easier testing and maintenance of code.

• There are three types of dependency injection: constructor injection, setter injection, and interface injection.

• Example: Instead of creating a database connection ob...read more

A pipe is a feature in Angular that allows you to transform data before displaying it.

• Pipes are used in Angular templates with the '|' symbol.

• There are built-in pipes like 'uppercase' and 'date'.

• Custom pipes can be created using the 'Pipe' decorator and implementing the 'PipeTransform' interface.

• Custom pipes can take arguments to modify their behavior.

• Pipes can be chained together to perform multiple transformations on

Middleware is software that acts as a bridge between different applications, allowing them to communicate and exchange data.

• Middleware is a layer of software that sits between applications and operating systems

• It provides services such as message routing, authentication, and data transformation

• Examples include Apache Tomcat, Microsoft IIS, and IBM WebSphere

No, assigning null to an array makes it empty and its length becomes 0.

• Assigning null to an array makes it empty.

• The length of an empty array is 0.

• Trying to access length property of null will result in an error.

Null value in JavaScript represents absence of any object value.

• Null is a primitive value in JavaScript.

• It is assigned to a variable to indicate that it has no value.

• It is different from undefined, which means a variable has been declared but not assigned a value.

• Null is falsy in JavaScript, meaning it is considered false in a boolean context.

• Null can be used to clear the value of an object property.