ZED Digital IOS Developer Interview Questions and Answers

Q1. Basic of Swift and Objective C
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Q1. Pure Technical Asking about your Project
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Q1. Salary Descussion with HR and normal HR Question
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Q1. Solid principle
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Q2. Weak and unowned reference difference
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Q3. All basic to advance question asked
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Q1. Basic information about yourself and salary discussion
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Q1. What is Protocol Oriented Programming
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Protocol Oriented Programming is a programming paradigm in Swift that focuses on defining protocols to define behavior.
• POP is a way of designing code by defining protocols that describe a set of behaviors.

• It encourages composition over inheritance, allowing for more flexible and reusable code.

• By using protocols, you can define a blueprint of methods and properties that a type must implement.
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Q2. What is Concurrency
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Concurrency is the ability of a system to execute multiple tasks simultaneously.
• Concurrency allows multiple tasks to run at the same time, improving performance and responsiveness.

• It can be achieved through techniques like multithreading and asynchronous programming.

• Concurrency is important in iOS development for tasks like networking, data processing, and UI updates.
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Q3. What are types of memory management in iOS
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Types of memory management in iOS include Automatic Reference Counting (ARC) and Manual Reference Counting (MRC).
• Automatic Reference Counting (ARC) - manages memory automatically by keeping track of object references.

• Manual Reference Counting (MRC) - requires developers to manually manage memory by retaining and releasing objects.

• ARC is the default memory management system in iOS, while MRC is used in older codebases o...read more
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Fetch data from API and showcase it onto a table view in swift

Q1. What is Weak & Unowned , ARC?
Ans. 
Weak & Unowned references are used in ARC to prevent retain cycles in Swift programming.
• Weak references do not increase the retain count of an object, and automatically become nil when the object is deallocated.

• Unowned references do not keep a strong reference to the object, and can become a dangling pointer if the object is deallocated.

• ARC (Automatic Reference Counting) is a memory management system used in Swift to a
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Q2. What is Autoclosure?
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Autoclosure is a feature in Swift that automatically wraps an expression in a closure.
• Autoclosure is used to delay evaluation of an expression until it is actually needed.

• It is commonly used with functions that take closures as arguments, allowing the caller to pass in a regular value instead of a closure.

• Autoclosures are created by adding @autoclosure attribute before the closure's parameter type.
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Q3. Code snippets for optional binding, find error ?
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Optional binding in Swift helps to safely unwrap optionals and check for nil values.
• Use if let or guard let to safely unwrap optionals and bind the value to a new constant or variable.

• Check for nil values before using the unwrapped value to avoid runtime errors.

• Example: if let name = optionalName { print(name) }

• Example: guard let age = optionalAge else { return }
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Q4. What are Access Controls/modifiers? public vs open?
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Access controls/modifiers determine the visibility and accessibility of classes, methods, and properties in object-oriented programming.
• public access control allows a class, method, or property to be accessed from anywhere in the code

• open access control allows a class to be subclassed outside of the module where it is defined

• public is commonly used in Swift for most cases, while open is used when you want to allow subc
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Q5. Protocol vs Closures?
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Protocols define a blueprint of methods, properties, and other requirements that a class or struct must adopt. Closures are self-contained blocks of functionality that can be passed around and used in your code.
• Protocols define a set of methods, properties, and other requirements that a class or struct must implement.

• Closures are self-contained blocks of functionality that can capture and store references to any consta...read more
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Q6. How you use GIT, How to manage conflicts?
Ans. 
I use GIT for version control and manage conflicts by resolving them through communication and collaboration.
• Regularly commit changes to keep track of progress

• Pull latest changes before making any updates to avoid conflicts

• Communicate with team members to resolve conflicts efficiently

• Use tools like Git merge or Git rebase to resolve conflicts

• Document resolution process for future reference
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Q1. Basic questions related to Swift like closure, optionals, gcd, operations. Questions related to sdks like firebase, push notifications
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Q1. It was about the projects, methodologies used, architecture, roles and responsibilities in team.
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Q1. What is optional, difference between struct and class?
Ans. 
Optional is a type in Swift that can hold a value or be nil. Struct and class are both used to define custom data types.
• Optional is denoted by a question mark (?) and is used to handle nil values.

• Structs are value types and are passed by value, while classes are reference types and are passed by reference.

• Structs have a default memberwise initializer, while classes do not.

• Classes can inherit from other classes, while s...read more
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