The Observer pattern (also known as publish/subscribe) provides a simple mechanism for one object to inform a set of interested third-party objects when its state changes.

Learn to use Docker to manage our Ruby interpreter and use it to template new Rails applications.

Decisions made during the development process can significantly affect how the production environment is architected. In this episode, we look at a few different scenarios and how the early decisions made in development affected the production infrastructure.

In this episode, we look at various questions asked during interviews.

In this episode, we look at the Liskov Substitution Principle. If S is a subtype of T, then objects of type T may be replaced with objects of type S without altering any of the desirable properties of the program.