Swift Questions et reponses d'entretien
Test your skills through the online practice test: Swift Quiz Online Practice Test
Question 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.
Est-ce utile ?
Ajouter un commentaire
Voir les commentaires
Question 7. What is the difference between 'let' and 'var' in Swift?
'let' is used to declare constants, and 'var' is used to declare variables.
Est-ce utile ?
Ajouter un commentaire
Voir les commentaires
Question 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.
Est-ce utile ?
Ajouter un commentaire
Voir les commentaires
Question 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.
Est-ce utile ?
Ajouter un commentaire
Voir les commentaires
Question 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.
Est-ce utile ?
Ajouter un commentaire
Voir les commentaires
Les plus utiles selon les utilisateurs :
- 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?