What is package visibility in Go?

What is package visibility in Go?

In Go, package visibility determines which identifiers (like functions, types, and variables) are accessible from other packages. Identifiers that start with an uppercase letter are exported and can be accessed from other packages, while those that start with a lowercase letter are 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 ExportedFunction (uppercase 'E'), it can be accessed from other packages. However, if you have a function named unexportedFunction (lowercase 'u'), it can only be called within its own package.

Why is package visibility important in Go?

Package visibility is important for encapsulation and maintaining a clean API. It helps prevent unintended interactions between packages and allows developers to expose only the necessary parts of their code.

How can I change the visibility of a function?

To change the visibility of a function, simply change the first letter of its name. Use an uppercase letter to make it exported and a lowercase letter to make it unexported.