What are the visibility rules in Go programming?

What are the visibility rules in Go programming?

In Go, visibility is determined by the case of the first letter of an identifier. If it starts with an uppercase letter, it's exported and accessible outside the package. If it starts with a lowercase letter, it's unexported and only accessible within the same package.

Can you give me an example of exported and unexported identifiers?

Sure! For example, if you have a function named PublicFunc() (uppercase 'P'), it can be accessed from other packages. But if you have privateFunc() (lowercase 'p'), it can only be accessed within its own package.

Are there any exceptions to these rules?

No, the rules are consistent. However, you can use interfaces to expose certain functionalities while keeping the underlying implementation unexported.

How do these rules affect package design?

They encourage encapsulation and modular design, allowing you to expose only what is necessary while keeping the rest hidden.