Can you explain the difference between structs and classes in Swift?

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Prompt Starters

1. Can you explain the difference between structs and classes in Swift?
2. Show me how to use closures in Swift for better code efficiency.
3. I'm struggling with concurrency in Swift. Can you provide some guidance?
4. What are the best practices for memory management in Swift applications?
5. How do I implement a Singleton pattern in Swift?
6. Can you help me understand Swift's error handling with a practical example?