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Question: What is a guard statement in Swift and how does it differ from an if statement?
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Answer: A guard statement in Swift is used to transfer program control out of a scope if one or more
conditions are not met. It is primarily used for early exit scenarios to improve code readability and reduce nesting.
Unlike an if statement, a guard statement requires that the conditions it guards against are always met
for the code following it to be executed.
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Question: What are Swift Playgrounds?
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Answer: The Swift Playgrounds are interactive development environments provided by Apple for writing and executing
Swift code. They are available on iPad and macOS and are used for learning, experimenting, and prototyping Swift code.
Playgrounds provide a live view of code execution, allowing developers to see the results of their code immediately
as they write it, making them particularly useful for educational purposes and exploring new ideas.
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Question: Can you explain the concept of 'type inference' in Swift?
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Answer: The type inference in Swift is the compiler's ability to deduce the data type of a variable or expression
based on its usage and context, without the need for explicit type annotations.
Swift uses type inference to make code cleaner and more concise while still maintaining type safety.
Type inference works by analyzing the types of values and expressions used in the code and deducing the appropriate types based on context.
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Question: What are the benefits of using Swift over Objective-C for iOS development?
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Answer: Swift offers several advantages over Objective-C for iOS development, including safety, performance,
modern language features, and interoperability with existing Objective-C code.
Swift's type safety, optionals, and automatic memory management through ARC help prevent common programming errors
and reduce the risk of crashes.
Swift is also faster and more efficient than Objective-C, thanks to its modern compiler and optimization features.
Additionally, Swift's syntax is more concise and expressive, making code easier to read and write.
Finally, Swift seamlessly interoperates with Objective-C, allowing developers to leverage existing Objective-C frameworks
and libraries in their Swift projects.
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Question: What are the different types of collections available in Swift?
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Answer: Swift provides three main types of collections:
• Arrays: arrays are ordered collections of values.
• Sets: sets are unordered collections of unique values.
• Dictionaries: dictionaries are unordered collections of key-value pairs.
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Question: What is the difference between "weak" and "unowned" references in Swift?
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Answer: Both "weak" and "unowned" are used to break retain cycles in Swift, but they have different behaviors.
The "weak" references allow the reference to become nil when the referenced object is deallocated, while "unowned" references
assume that the referenced object will always exist and do not keep a strong reference.
Accessing an "unowned" reference after the referenced object has been deallocated leads to a runtime crash.
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