The Composite pattern

Phoebe continued to work on the electronics. Kitty, however, was starting to worry about some of the fundamental considerations for her designs. Initially, the girls had agreed to use commercially available components, but Phoebe realized they could manufacture all the parts they need themselves. That way, assuming Bumble Bikes had access to all the raw materials, such as aluminum alloys, plastic, and rubber, they could have tighter control over the cost, durability, and weight of their final product. These factors influence everything from how Bumble Bikes sources its raw materials to the final sales price. The final sales price is factored by adding in the cost of goods sold, or in this case, the cost to manufacture, package, and deliver a bicycle. Kitty had some preliminary spreadsheets on her iPad. They were complicated, though. Kitty really wanted to ditch the two-dimensional thinking presented by her spreadsheets and come up with a better way to represent...