Swift perguntas e respostas de entrevista
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Pergunta 6. Explain optionals in Swift.
Optionals are a type in Swift that represents either a wrapped value or nil, indicating the absence of a value.
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Pergunta 7. What is the difference between 'let' and 'var' in Swift?
'let' is used to declare constants, and 'var' is used to declare variables.
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Pergunta 8. What is a closure in Swift?
A closure is a self-contained block of functionality that can be passed around and used in your code.
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Pergunta 9. 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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Pergunta 10. What is ARC (Automatic Reference Counting) in Swift?
ARC is a memory management feature in Swift that automatically tracks and manages the memory usage of your app.
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Mais uteis segundo os usuarios:
- What is Swift?
- Explain optionals in Swift.
- What is the difference between 'let' and 'var' in Swift?
- What are property observers in Swift?
- What is the purpose of the 'static' keyword in Swift?