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WithoutBook LIVE Mock Interviews Swift Related interview subjects: 9

Interview Questions and Answers

Know the top Swift interview questions and answers for freshers and experienced candidates to prepare for job interviews.

Total 49 questions Interview Questions and Answers

The Best LIVE Mock Interview - You should go through before interview

Know the top Swift interview questions and answers for freshers and experienced candidates to prepare for job interviews.

Interview Questions and Answers

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Intermediate / 1 to 5 years experienced level questions & answers

Ques 1

Explain the difference between a value type and a reference type in Swift.

A value type is copied when it's assigned to a new variable or passed as an argument, while a reference type refers to the same instance of the data.
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Ques 7

Explain the difference between synchronous and asynchronous tasks in Swift.

Synchronous tasks block the current thread until they are completed, while asynchronous tasks allow the program to continue executing other tasks without waiting.
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Ques 8

What is the role of the 'unowned' keyword in Swift?

The 'unowned' keyword is used in Swift to declare a reference that does not keep a strong hold on the instance it refers to, and it is assumed to always have a value.
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Ques 10

How does Swift handle memory management compared to Objective-C?

Swift uses Automatic Reference Counting (ARC) for memory management, eliminating the need for manual memory management in Objective-C.
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Ques 11

Explain the difference between a struct and a class in Swift.

Structs are value types, while classes are reference types. Structs are copied when assigned or passed, whereas classes share a reference to the same instance.
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Ques 13

How do you create a custom delegate in Swift?

To create a custom delegate in Swift, define a protocol, adopt it in the delegating class, and use optional delegate methods to notify the delegate of events.
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Ques 14

Explain the concept of value semantics in Swift.

Value semantics mean that the value of a type is copied when assigned to a new variable or passed as an argument, ensuring that each instance is independent.
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Ques 16

Explain the difference between '==', '===', and 'isEqual' in Swift.

'==' is used to check for value equality, '===' is used to check for reference equality, and 'isEqual' is typically used for comparing objects in Objective-C and is bridged to '==' in Swift.
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Ques 17

Explain the 'escaping' closure and why it's necessary in Swift.

An 'escaping' closure is a closure that is called after the function it was passed to has returned. It's necessary when the closure is stored or outlives the scope of the function.
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Ques 18

Explain the difference between 'defer' and 'finally' in Swift.

'defer' is used to execute a block of code just before the scope is exited, while 'finally' is not used in Swift. Instead, error handling with 'defer' and 'catch' is more idiomatic.
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Ques 19

Explain the purpose of 'inout' parameters in Swift functions.

'inout' parameters allow a function to modify the value of the parameter directly, and any changes made inside the function affect the original value outside the function.
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Ques 20

What is a closure capture list, and when would you use it?

A closure capture list specifies how variables and constants are captured and held by a closure. It's useful to prevent strong reference cycles, especially when capturing 'self' in closures.
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Ques 21

What is the purpose of the 'autoreleasepool' in Swift?

The 'autoreleasepool' is used to manage the lifecycle of objects in memory, especially in performance-critical code or when working with Objective-C APIs.
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Ques 24

What are Swift access control levels, and how are they used?

Swift has five access control levels: 'open', 'public', 'internal', 'fileprivate', and 'private'. They control the visibility of classes, methods, and properties.
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