Infosys BPM IOS Developer Interview Questions and Answers

Q1. Diff b/w diff and guard
Ans. 
diff is used to compare two collections and return the differences, while guard is used for early exit in a function if a condition is not met.
• diff is a method used in Swift to compare two collections and return the differences.

• guard is a keyword used in Swift to provide an early exit from a function if a condition is not met.

• Example: let array1 = [1, 2, 3, 4], array2 = [3, 4, 5, 6]; let result = array1.diff(array2) //...read more
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Q2. What is GCD and Multitreadung
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GCD stands for Grand Central Dispatch, a technology used in iOS for managing concurrent operations. Multithreading is the ability of a CPU to execute multiple threads concurrently.
• GCD is used for managing tasks asynchronously and efficiently utilizing system resources.

• Multithreading allows multiple tasks to run concurrently, improving performance and responsiveness of an application.

• Example: Using GCD to download image...read more
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Q1. I interned here in my second-year summer. I got selected on the basis of resume shortlisting.
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Q2. There was no technical round
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Q1. Access specifiers
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Q2. Write code to get distinct members in array with same sequence
Ans. 
Use a Set to get distinct members in array while maintaining sequence.
• Iterate through the array and add each element to a Set to automatically remove duplicates.

• Create a new array by iterating through the Set to maintain the original sequence.
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Q1. Multi threading
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Q2. Generic function
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Q3. Dependency injection
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Q4. Struct vs Class
Ans. 
Struct is a value type, Class is a reference type in Swift.
• Structs are passed by value, Classes are passed by reference.

• Structs are immutable by default, Classes are mutable.

• Use Structs for simple data types, Classes for more complex objects.
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Q5. Type inference, type casting
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Remove duplicate elements from list.

Q1. What is the reason to change the job?
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Q2. I was exploring for growth opportunities and IBM is a good organization to grow looking at its ML technologies IBMWatson.
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Q1. What is serialisation in API
Ans. 
Serialisation in API is the process of converting data into a format that can be easily transmitted over a network.
• Serialisation is used to convert complex data structures into a format that can be easily transmitted over a network.

• It involves converting objects or data structures into a stream of bytes that can be sent over a network.

• JSON and XML are commonly used formats for serialising data in APIs.

• Serialisation is ...read more
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Q2. What is codable
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Codable is a protocol in Swift that allows for easy encoding and decoding of data types to and from external representations.
• Codable protocol is used to convert custom data types to and from external representations such as JSON, plist, etc.

• It requires the types to conform to Encodable and Decodable protocols.

• Codable protocol provides default implementations for encoding and decoding.

• Example: struct Person: Codable { v...read more
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Q3. What is MVVM architecture
Ans. 
MVVM is an architectural design pattern that separates the user interface code from the business logic and data model.
• MVVM stands for Model-View-ViewModel

• Model represents the data and business logic

• View displays the UI elements and interacts with the user

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

• MVVM helps in achieving separation of concerns and making the code
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Q4. Solid principles
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Q5. Coredata stack questions
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Q6. Swift Optional related
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Q7. About GCD, Concurrency
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Q8. Dependency injection and inversion
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Q9. About singleton, is it thread safe ?
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Q10. Guard let, if let difference
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Q11. Failable initialisers
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Q12. Class struct difference
Ans. 
Classes are reference types, while structs are value types in Swift.
• Classes are reference types, meaning they point to the same instance in memory when assigned to a new variable.

• Structs are value types, meaning they create a new copy when assigned to a new variable.

• Classes support inheritance, while structs do not.

• Classes can have deinitializers, while structs cannot.

• Example: class Person { var name: String } vs struc
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Q13. About protocols, associated type, delegate examples
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Q14. About identifiable protocol
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Q1. When you can join
Ans. 
I can join within 2 weeks of receiving an offer.
• I can start within 2 weeks of receiving an offer

• I need to give notice at my current job before starting

• I have some personal commitments that I need to wrap up before joining
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