Summary

We have, at last, written our first class. We have seen that we can implement a class in a file of the same name as the class. The class itself doesn't do anything until we instantiate an object/instance of the class. Once we have an instance of the class, we can use its special variables, called properties, and its non-private functions. As we proved in the Basic Classes app, every instance of a class has its own distinct properties, just as when you buy a car made in a factory, you get your very own steering wheel, satnav, and go-faster stripes. We have also bumped into the concept of references, which means that, when we pass an instance of a class to a function, the receiving function has access to the actual instance.

All this information will raise more questions. OOP is like that. So, let's try and consolidate all this class stuff by taking a much closer look at inheritance in the next chapter.