What is guard in Swift?

Related questions

1. What is use of guard in Swift?
2. What are initializer in Swift?
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4. What is difference between if let and guard in Swift?
5. What is type inference in Swift?
6. What does exclamation mark mean in Swift?
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Tags

1. #guard
2. #alternative
3. #former
4. #defer
5. #little
6. #allows
7. #already
8. #statement
9. #combines
10. #avoid
11. #joined
12. #pyramid
13. #concepts
14. #swift
15. #optional
16. #powerful
17. #fanfare
18. #clauses
19. #where
20. #unwrapping