Reserved keywords are special words defined in programming languages that have Special meanings and should not be used as Identiifiers.

These keywords are reserved to write the programming logic and should not be used to name variables and functions.

However, If you do use them to name variables or functions your code would not run correctly.

Here are the 31 keywords available in Solidity.

The 31 Reserved Keywords

1. after
2. alias
3. apply
4. auto
5. byte
6. case
7. copyof
8. default
9. defined
10. final
11. implements
12. in
13. inline
14. let
15. macro
16. match
17. mutable
18. null
19. of
20. partial
21. promise
22. reference
23. relocatable
24. sealed
25. sizeof
26. static
27. supports
28. switch
29. typedef
30. typeof
31. var

What if I use a reserved keyword as an Identiifier?

This would raise a parser error and your code won't compile.

ParserError: Expected identifier but got reserved keyword

How to fix the ParserError?

Scan your code for instances where you used a keyword as a variable name. Or a function name. Then replace every single instance with a non-reserved keyword. Look through the list above and avoid every single one of them.

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