When database tables get large, things can slow down significantly. In this episode, we look at a few things which helps keep databases performant and the client side responsive.

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.

Open/Closed principle states "software entities (classes, modules, functions, etc.) should be open for extension, but closed for modification"; that is, such an entity can allow its behaviour to be extended without modifying its code.

A class should only have a single responsibility, that is, only changes to one part of the software's specification should be able to affect the specification of the class.

Dragon Ruby is toolchain that allows developers the ability to build apps and games in Ruby.