1. Constructors
2. new
3. Properties
4. countryCode
5. hashCode
6. languageCode
7. runtimeType
8. scriptCode
9. variants
10. Methods
11. noSuchMethod
12. toLanguageTag
13. toString
14. Operators
15. operator ==
16. Static methods
17. fromSubtags
18. parse
19. tryParse