What is optional chaining in Swift?

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  1. #failure
  2. #querying
  3. #messaging
  4. #works
  5. #calling
  6. #properties
  7. #methods
  8. #similar
  9. #objective
  10. #swift
  11. #subscripts
  12. #checked
  13. #might
  14. #optional
  15. #chaining
  16. #process
  17. #currently
  18. #success