Class Hierarchy
Let’s learn how to create a class hierarchy.
We'll cover the following...
Whenever a class hierarchy is more complex, we can’t simply eliminate it, but instead have to implement it in the following places:
- In the app’s model code.
- In the underlying database.
- In its user interface.
The starting point for our case study is the design model shown below.
We derive a JS class model and a JS entity table model from the design model in the following lessons. The entity table model is used as a design for the object-to-storage mapping that we need to store our application’s objects with the browser’s local ...