Photon Interactive Interview Questions, Process, and Tips

Q1. Explain about MVVM
Ans. 
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
Ans. 
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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Java oops concepts
collections
spring framework

Q1. About project performance improvement of application db performance issues
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Q1. Difference between default and props
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Q2. How do you know the dom is ready or not
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Q1. Can you introduce yourself?
Ans. 
I am a software engineer with 5 years of experience in developing web applications using Java, Spring, and Angular.
• 5 years of experience in software development

• Proficient in Java, Spring, and Angular

• Strong problem-solving skills
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Q2. What is your experience with implementing lazy loading?
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Implemented lazy loading in web applications to improve performance by loading content only when needed.
• Implemented lazy loading for images on a website to reduce initial page load time.

• Utilized libraries like Intersection Observer to trigger loading of elements when they come into view.

• Implemented lazy loading for components in a single page application to improve user experience.
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