Defining a class 

Back in Chapter 2, The Building Blocks of Programming, we briefly talked about how classes are blueprints for objects and mentioned that they can be treated as custom variable types. We also learned that the LearningCurve script is a class, but a special one that Unity can attach to objects in the scene. The main thing to remember with classes is that they are reference types—that is, when they are assigned or passed to another variable, the original object is referenced, not a new copy. We'll get into this after we discuss structs. However, before any of that, we need to understand the basics of creating classes.