What are custom types in the fmt package?

What are custom types in the fmt package?

Custom types in the fmt package allow you to define how your types are formatted when using functions like Printf.

Can you give me an example of a custom type?

Sure! For instance, you can create a custom type called 'Person' and implement the Stringer interface to format it.

How do I implement the Stringer interface?

You need to define a method called String() that returns a string representation of your type.

What happens if I don't implement the Stringer interface?

If you don't implement the Stringer interface, the default formatting will be used, which may not be user-friendly.