To learn about how to organize code to accommodate changing expectations in a project.
v1.0 - Cat image that updates a counter when clicked.
v2.1 - Same, but for 2 cat images, and include the cat's name.
v3.0 (Premium) - A list of 5+ cat names. When a name is clicked, the cat's image and counter are displayed. Clicking on the cat's image still updates its counter.