Why need to create class instead of interface ?( Replace Method with Method Object.)

Great website! Simple and easy to understand. I would love to see some tests you can take to make sure you understood it all correctly.

Primitive obsesion VS Data class

Refactoring process

your site is awsome

Example of source codes that contain Bade Smell?

I'm having problem with https://refactoring.guru/home/slides/large-class

Thanks a lot for this course!

Posibility to hide right or left side of the site

Really great course! I am glad I bought it.