Ask HN: What are some good books to improve on object oriented design?

Smalltalk is object oriented from the ground up and this book is full of advice and examples of good OOAD. Even if your every day language is Java, C++ or something else, this book will show you OO the way it was meant to be done.

It's not quite as easy to follow as the Sandi Metz book I mentioned above, but worth the effort.

j.

Even if you code in a language other than Ruby, this book is quite easy to follow and chock full of great OO advice.