Photon Interactive Interview Questions, Process, and Tips

Q1. Explain about MVVM
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MVVM is an architectural pattern used in software development, particularly in Android apps, to separate the user interface from the business logic.
• MVVM stands for Model-View-ViewModel

• Model represents the data and business logic

• View is the UI component that displays the data and interacts with the user

• ViewModel acts as a mediator between the Model and View, handling user interactions and updating the Model

• MVVM helps in...read more
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Q2. Kotlin scope function
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Q3. Sealed claa in kotlin
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Sealed classes in Kotlin are used to represent restricted class hierarchies.
• Sealed classes can have a limited set of subclasses defined within the same file.

• They are useful for representing a fixed set of types in a hierarchy.

• Sealed classes are often used in when expressions for exhaustive checks.
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Q4. Extension function in kotlin
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Extension functions in Kotlin allow you to add new functions to existing classes without modifying their source code.
• Extension functions are defined outside of the class they extend.

• They can be called on instances of the class as if they were regular methods.

• They can access the properties and methods of the class they extend.

• Example: fun String.isEmailValid(): Boolean { ... }

• Example: fun Int.isEven(): Boolean { ... }
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Q5. Null safety in kotlin
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Null safety in Kotlin ensures that variables cannot hold null values unless explicitly specified.
• Kotlin uses nullable and non-nullable types to enforce null safety.

• The '?' operator is used to declare a variable as nullable.

• Safe call operator '?.' is used to safely access properties or methods of nullable objects.

• The '!!' operator is used for force unwrapping nullable types, but can lead to NullPointerExceptions.
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Q6. Room data base explanation
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Room database is a persistence library that provides an abstraction layer over SQLite to allow for more robust database access while harnessing the full power of SQLite.
• Room database simplifies database interactions by providing compile-time verification of SQL queries.

• It consists of three main components: Entity, DAO (Data Access Object), and Database.

• Entities represent tables in the database, DAOs define methods to i...read more
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Q7. Find the vowels in a string and convert that into upper case
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Convert vowels in a string to uppercase
• Iterate through each character in the string

• Check if the character is a vowel (a, e, i, o, u)

• If it is a vowel, convert it to uppercase
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Q8. Explain about jet compose
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Jet Compose is a modern UI toolkit for building native Android apps using a declarative approach.
• Jet Compose is a declarative UI framework for building Android apps.

• It allows developers to create UI components using Kotlin code.

• Jet Compose simplifies UI development by eliminating the need for XML layouts.

• It provides a more flexible and efficient way to create dynamic UIs.

• Jet Compose is part of the Jetpack libraries pro
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Q1. Custom painting widget
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Q2. Web sockets implementation
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Q3. Bloc Architecture
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Q4. Pagination in Flutter
Ans. 
Pagination in Flutter allows for efficient loading of large data sets by fetching and displaying data in chunks.
• Use ListView.builder with a custom itemBuilder function to dynamically load data as the user scrolls.

• Implement a pagination logic to fetch more data when the user reaches the end of the current data set.

• Update the ListView with the new data and continue the process until all data is loaded.

• Consider using pack...read more
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Q5. Adding and customising voice over (accessibility) support to Flutter app
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To add voice over (accessibility) support to a Flutter app, use the accessibility features provided by Flutter and customize them as needed.
• Use Semantics widget to add accessibility labels and actions to widgets in the app

• Customize the voice over experience by providing specific instructions and descriptions for each widget

• Test the accessibility features using a screen reader to ensure they work as intended
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Bloc Architecture and implementation

Q1. Nodejs, REST API, validation, etc
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Q1. Tried to low ball
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Q1. Solid principle implemantion in c#
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Solid principles are a set of design principles that help make software more maintainable, flexible, and scalable.
• Single Responsibility Principle (SRP) - A class should have only one reason to change.

• Open/Closed Principle (OCP) - Software entities should be open for extension but closed for modification.

• Liskov Substitution Principle (LSP) - Objects of a superclass should be replaceable with objects of its subclasses wi...read more
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Q2. Write a code for Entity framework DB connection
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Code snippet for Entity Framework DB connection
• Install Entity Framework NuGet package

• Create a DbContext class

• Define DbSet properties for each entity

• Configure connection string in app.config/web.config

• Use DbContext to interact with the database
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Q3. Get 3 rd highest salary
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To get the 3rd highest salary, we can use a SQL query with the 'LIMIT' and 'OFFSET' keywords.
• Use a SQL query with 'ORDER BY salary DESC' to sort salaries in descending order.

• Use 'LIMIT 1 OFFSET 2' to skip the first two highest salaries and get the 3rd highest salary.

• Example: SELECT salary FROM employees ORDER BY salary DESC LIMIT 1 OFFSET 2;
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Q4. Why we using interface in C#
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Interfaces in C# provide a way to define a contract for classes to implement, promoting code reusability and flexibility.
• Interfaces allow for multiple inheritance in C# by allowing a class to implement multiple interfaces.

• Interfaces help in achieving loose coupling between classes, making the code more maintainable and testable.

• Interfaces are used to define common behavior that multiple classes can share, promoting cod...read more
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Q1. Why you want to change the company
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Q1. Scenario based nodejs questions
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Q1. Tell me about yourself
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