Cybage Interview Questions and Answers

Both coding and aptitude interview

Q1. What is react? What is css? What is redux?
Ans. 
React is a JavaScript library for building user interfaces. CSS is a styling language used to design web pages. Redux is a predictable state container for JavaScript apps.
• React is used for building reusable UI components

• CSS is used to style and layout web pages

• Redux is used for managing the state of an application

• React and Redux are often used together to build complex web applications
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Q2. What is dataflow of react
Ans. 
React dataflow is unidirectional, from parent to child components via props and from child to parent via callbacks.
• React follows a unidirectional data flow architecture.

• Parent components pass data down to child components via props.

• Child components can update the parent's state via callbacks.

• This helps to maintain a clear and predictable flow of data throughout the application.

• Redux can be used to manage more complex d
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2 technical questions

Q1. Java collections framework
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Q2. Strings in Java
Ans. 
Strings in Java are sequences of characters used to store and manipulate text data.
• Strings in Java are immutable, meaning their values cannot be changed once they are created.

• String objects can be created using the 'new' keyword or by directly assigning a string literal.

• Common string operations in Java include concatenation, substring extraction, and comparison.
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Q1. Oops, SOLID Principles, Design patterns.
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Q2. What is Delegate and what are the types?
Ans. 
Delegate is a type that represents references to methods with a specific parameter list and return type.
• Delegates are similar to function pointers in C++.

• They are used to achieve loose coupling and separation of concerns.

• There are two types of delegates: singlecast and multicast.

• Singlecast delegates can hold references to a single method.

• Multicast delegates can hold references to multiple methods.

• Delegates are commonly
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Q3. What is custom middleware in .net core
Ans. 
Custom middleware in .NET Core is a piece of code that sits between the request and response pipeline to perform custom operations.
• Custom middleware can be used to add custom headers, logging, authentication, and authorization to the request pipeline.

• Middleware can be added to the pipeline using the Use() method in the Startup.cs file.

• Middleware can be created using classes that implement the IMiddleware interface or b...read more
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Q4. What is difference between abstract class and interface.
Ans. 
Abstract class can have implementation while interface only has method signatures.
• Abstract class can have constructors while interface cannot.

• A class can implement multiple interfaces but can only inherit from one abstract class.

• Abstract class can have non-public members while interface only has public members.

• Abstract class is used for creating a base class while interface is used for implementing a contract.

• Example o...read more
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Q5. Difference Between temp table and table variable
Ans. 
Temp table is stored in tempdb and table variable is stored in memory.
• Temp table is created using CREATE TABLE statement and can be accessed by multiple sessions.

• Table variable is created using DECLARE statement and can only be accessed within the scope of the batch or procedure.

• Temp table can have indexes and statistics while table variable cannot.

• Temp table is useful for large data sets while table variable is useful...read more
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Q6. Queries using joins in SQL
Ans. 
Joins in SQL are used to combine data from two or more tables based on a related column.
• Joins are used to retrieve data from multiple tables in a single query.

• Common types of joins include inner join, left join, right join, and full outer join.

• Join conditions are specified using the ON keyword and can include multiple conditions.

• Aliases can be used to simplify the syntax of join queries.

• Joins can be nested to combine d
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Q1. Positions in CSS
Ans. 
Positions in CSS refer to the different ways elements can be placed on a webpage.
• Static: default positioning, elements flow in the order they appear in the HTML

• Relative: positioned relative to its normal position

• Absolute: positioned relative to its nearest positioned ancestor

• Fixed: positioned relative to the viewport and does not move when scrolled
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Q2. Event loop in javascript
Ans. 
Event loop in JavaScript manages asynchronous operations by executing callback functions in a queue.
• Event loop is responsible for handling asynchronous operations in JavaScript.

• It allows non-blocking I/O operations by executing callback functions in a queue.

• Event loop continuously checks the call stack and the callback queue to prioritize tasks.
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2 simple questions were asked on DSA

Q1. Which Angular version have you used
Ans. 
I have used Angular version 8 and 9 in my previous projects.
• Used Angular 8 for a project that required advanced routing and lazy loading features

• Upgraded to Angular 9 to take advantage of improved performance and Ivy rendering engine
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Q2. Pipes in Angular
Ans. 
Pipes in Angular are used for transforming data in templates.
• Pipes are used to format data before displaying it in the view.

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

• Custom pipes can also be created for specific formatting needs.

• Pipes can be chained together for multiple transformations.

• Example: {{ birthday | date:'MM/dd/yyyy' }} will format the birthday date.
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Q1. Java related questions
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