When should I use modules instead of extensions?

When should I use modules instead of extensions?

You should use modules when you need to encapsulate functionality and manage dependencies, while extensions are better for adding features to existing classes.

Can you give me an example of a module?

Sure! A module could be a library that handles user authentication, providing functions to register, log in, and manage user sessions.

And what about extensions? Can you explain that?

Extensions are used to add new functionality to existing classes. For example, you might extend a string class to include a method that counts vowels.

Are there any performance considerations between the two?

Yes, modules can be more efficient as they load only when needed, while extensions might add overhead to the existing classes.