What is the difference between NSOperationQueue and GCD?

Related questions

1. What is capture list in Swift?
2. What are blocks in Swift?
3. What is the difference between GCD and NSOperationQueue in iOS?
4. What are dispatch queues?
5. What is facade design pattern in iOS?
6. What is completionHandler?
7. What is async code?
8. Is Swift asynchronous?
9. What is a callback in Swift?
10. What is a block Objective C?

Tags

1. #class
2. #execute
3. #nsoperationqueue
4. #queue
5. #other
6. #instances
7. #model
8. #encapsulated
9. #enables
10. #level
11. #tasks
12. #abstraction
13. #operation
14. #developers
15. #queues
16. #nsoperation
17. #concurrently
18. #built