Movius Corp IOS Developer Interview Questions, Process, and Tips

Q1. What are the SOLID principles in software development?
Ans. 
SOLID principles are a set of five design principles in object-oriented programming to 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...read more
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Q2. What is the difference between the Liskov Substitution Principle and the Interface Segregation Principle?
Ans. 
Liskov Substitution Principle focuses on inheritance while Interface Segregation Principle focuses on interfaces.
• Liskov Substitution Principle states that objects of a superclass should be replaceable with objects of its subclasses without affecting the program's correctness.

• Interface Segregation Principle states that a client should not be forced to implement interfaces they do not use.

• Liskov Substitution Principle is...read more
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Q3. What are computed properties?
Ans. 
Computed properties are properties in Swift that do not store a value directly, but instead provide a getter and an optional setter to retrieve and set their value.
• Computed properties do not have a backing store like stored properties.

• They are used to calculate a value on-the-fly based on other properties or data.

• Example: calculating the area of a square based on its side length.
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Q4. What is a retain cycle in programming?
Ans. 
A retain cycle in programming occurs when two objects hold a strong reference to each other, preventing them from being deallocated.
• Retain cycles can lead to memory leaks in iOS development.

• To break a retain cycle, one of the objects involved needs to have a weak reference to the other.

• An example of a retain cycle is when a parent object holds a strong reference to a child object, and the child object holds a strong re
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Q5. What is Automatic Reference Counting, and how does it work?
Ans. 
Automatic Reference Counting (ARC) is a memory management feature in iOS development that automatically manages memory by keeping track of references to objects.
• ARC automatically adds and removes retain/release calls to manage memory for objects.

• It helps prevent memory leaks by deallocating objects when they are no longer needed.

• ARC is the default memory management model in Swift and Objective-C.

• Example: var myObject =...read more
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Q6. What are the benefits of using Structs over Classes in SwiftUI?
Ans. 
Structs are value types, leading to better performance and memory management in SwiftUI.
• Structs are value types, meaning they are copied when passed around, leading to better performance compared to reference types like classes.

• Structs are immutable by default, making it easier to reason about the state of your app and preventing unexpected changes.

• Structs are more lightweight than classes, which can lead to better mem...read more
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Q7. What is the mutating keyword?
Ans. 
The mutating keyword is used in Swift to indicate that a method is allowed to modify the properties of a value type.
• Used in Swift with value types like structs and enums to allow methods to modify their properties

• Prevents compilation error when attempting to modify properties of a value type within a method

• Example: mutating func updateValue(newValue: Int) { self.value = newValue }
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Q8. Can you tell me about yourself?
Ans. 
I am a passionate IOS Developer with 5 years of experience in developing mobile applications.
• 5 years of experience in IOS development

• Proficient in Swift and Objective-C programming languages

• Strong knowledge of iOS SDK and Xcode IDE

• Experience in integrating third-party libraries and APIs

• Designed and developed user-friendly interfaces for various apps
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Q9. What is the time complexity for finding the longest common prefix in a given array of strings? (to be done in playground)
Ans. 
The time complexity for finding the longest common prefix in an array of strings is O(n*m), where n is the number of strings and m is the length of the longest string.
• Iterate through the characters of the first string and compare them with the corresponding characters of the other strings.

• The worst-case scenario is when all strings have the same prefix, resulting in O(n*m) time complexity.

• Example: For strings ['apple',...read more
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Q10. What will be the output of the following Swift code: \n\nstruct s1Struct {\n var abc = "Hello"\n \n func change() {\n abc = "bye"\n }\n}\n\nvar a = s1Struct()\na.change()\nprint(a.abc)
Ans. 
The output will be 'bye'.
• The code defines a struct 's1Struct' with a property 'abc' initialized to 'Hello'.

• It also has a method 'change()' that changes the value of 'abc' to 'bye'.

• An instance 'a' of 's1Struct' is created and its 'change()' method is called.

• Finally, the value of 'abc' in the instance 'a' is printed, which will be 'bye'.
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Q1. Several iOS and Swift questions with 2 iOS Engineers
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Q2. How you handle reference cycle?
Ans. 
Handle reference cycles by using weak or unowned references to break the strong reference cycle.
• Use weak or unowned references to break strong reference cycles

• Weak references do not keep a strong hold on the instance they refer to

• Unowned references assume that the instance they refer to will never be nil
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Q3. How did you use Combine?
Ans. 
I used Combine to handle asynchronous events and data streams in my iOS app development.
• Used Combine to manage network requests and responses

• Implemented Combine to handle user input and UI updates

• Utilized Combine to combine multiple data streams and perform operations on them
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Swift ui api parsing