Applaunch IOS Developer Interview Questions and Answers

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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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. What is closure? Life cycle of escaping closure?
Ans. 
A closure is a self-contained block of code that can be passed around and used in your code. An escaping closure is a closure that is called after the function it was passed to has returned.
• Closure is a block of code that can be passed around and used in your code.

• Escaping closure is called after the function it was passed to has returned.

• Example: Using a completion handler in a network request to handle the response a
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Q2. What is multi threading?
Ans. 
Multi threading is the ability of a CPU to execute multiple threads concurrently, allowing for improved performance and responsiveness in applications.
• Allows for parallel execution of tasks, improving performance

• Enables applications to remain responsive while performing intensive tasks

• Can lead to synchronization issues if not managed properly
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Q1. Asked basic iOS Developer interview questions
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Q1. Define Operation queue
Ans. 
Operation queue is a way to manage and execute tasks asynchronously in iOS applications.
• Operation queue allows you to add tasks (operations) to a queue and execute them in the background.

• It provides control over the execution of tasks, such as setting dependencies between tasks.

• Operations can be added to the queue with different priorities, allowing for better task management.

• Example: NSOperationQueue is a class in iOS
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Q2. Define optionals in swift
Ans. 
Optionals in Swift are used to represent a value that may or may not exist.
• Optionals are denoted by adding a question mark (?) after the type declaration.

• They can either contain a value or be nil.

• Optionals must be unwrapped before using their value to avoid runtime errors.

• Optional binding and optional chaining are commonly used with optionals.
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