Einfochips Senior IOS Developer Interview Questions and Answers

Q1. Atomic vs Non-Atomic
Ans. 
Atomic means thread-safe access, non-atomic is not thread-safe
• Atomic ensures that a property is always fully set or retrieved, while non-atomic does not guarantee this

• Atomic properties are slower due to the overhead of ensuring thread safety

• Non-atomic properties are faster but can lead to data corruption in a multi-threaded environment
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Q2. SSL Pinning with different ways
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SSL pinning is a security measure to prevent man-in-the-middle attacks by associating a specific SSL certificate with a particular app.
• Implementing SSL pinning using public key

• Implementing SSL pinning using certificate

• Implementing SSL pinning using hash of certificate
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Q1. Types of job in kotlin coroutine
Ans. 
Types of jobs in Kotlin coroutine include launch, async, withContext, and runBlocking.
• launch: starts a new coroutine without blocking the current thread

• async: starts a new coroutine and returns a Deferred object with a result

• withContext: switches the coroutine context within a coroutine

• runBlocking: blocks the current thread until the coroutine inside it is completed
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Q2. What is Flow, Channel diffrent between StateFlow and SharedFlow
Ans. 
Flow is a cold asynchronous data stream, Channel is a hot asynchronous data stream. StateFlow is a hot asynchronous data stream with a state, SharedFlow is a hot asynchronous data stream without a state.
• Flow is a cold asynchronous data stream that emits values one by one.

• Channel is a hot asynchronous data stream that can have multiple subscribers.

• StateFlow is a hot asynchronous data stream that retains the most recent ...read more
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Q3. If Flow lifecycle aware
Ans. 
Flow lifecycle aware means using Kotlin Flow with lifecycle awareness in Android development.
• Flow lifecycle aware helps manage data streams in Android apps

• It ensures that data emissions are only observed when the lifecycle is in the appropriate state

• Example: Using Flow with LiveData to update UI components based on lifecycle events
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Q4. What is inline function and highorder function?
Ans. 
Inline functions are functions that are expanded in place at the call site, while high-order functions are functions that can take other functions as parameters or return them.
• Inline functions are expanded in place at the call site to improve performance.

• High-order functions can take other functions as parameters or return them.

• Example of high-order function: map() function in Kotlin.
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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
Ans. 
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
Ans. 
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
Ans. 
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
Ans. 
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
Ans. 
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. Mostly in automotive android
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Q2. What is car propertymanager and mostly in to aosp
Ans. 
Car propertymanager is a component in AOSP that manages properties related to car-specific features.
• Car propertymanager is used to handle properties like car make, model, year, etc.

• It is mostly used in Android Automotive OS for managing car-specific settings and configurations.

• Developers can use car propertymanager to access and modify car-related properties in their apps.
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Q1. Software skills assessment
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Q1. More than technical it was soft skills assessment
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Q1. Oops based question
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Q2. Solid principles and how to implement
Ans. 
Solid principles are a set of five design principles for writing maintainable and scalable code.
• Single Responsibility Principle: A class should have only one reason to change.

• Open/Closed Principle: Classes should be open for extension but closed for modification.

• Liskov Substitution Principle: Objects of a superclass should be replaceable with objects of its subclasses without affecting the program's correctness.

• Interfa...read more
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Tata using network layer

Q1. Questions on MVVM, LiveData and Kotlin
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Q1. Andriod concets, Livedata, viewModal, Corotines, Kotlin & Java concepts
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Q1. 1. Why are you choosing this company? 2. If there is high package job & high knowledge job, which one you will choose? 3. Where do you see yourself in 5 years?
Ans. 
I am choosing this company because of its strong reputation, innovative projects, and great work culture.
• Strong reputation: The company has a proven track record of success and is highly regarded in the industry.

• Innovative projects: The company is known for its cutting-edge technology and exciting projects, which will provide me with opportunities to learn and grow.

• Great work culture: The company values its employees a...read more
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Q1. Jetpack components, kotlin basics, java program, fragment life cycle Inner class
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Q1. More about project Challenge in project About git
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Q1. Questions related to basics of Kotlin
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Q2. Questions related to basics of Android
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Q1. Salary negotiation
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