What are the common mistakes with variance in generics?

What are the common mistakes with variance in generics?

Common mistakes include confusing covariance and contravariance, and not understanding how they affect type safety.

Can you explain covariance and contravariance?

Covariance allows a type to be substituted with its subtypes, while contravariance allows substitution with supertypes.

How can I avoid these mistakes in my code?

To avoid mistakes, always use the correct variance annotations and thoroughly test your generic types.

Are there any resources for learning more about this?

Yes, consider checking out documentation on generics in your programming language and online courses on type theory.