Rendering lists and detail views

So far, we’ve seen a great deal of test-driven development, but not much of React. In this section, we’ll take what we’ve learned about TDD and apply it to learning more React.

Our app at the moment just displays a single thing—a customer’s name. Now, we'll extend it so that we have a view of all appointments that are happening today.

Let's do a little more up-front design. We've got an Appointment component that takes an appointment and displays it. We can build an AppointmentsDayView component around it that takes an array of appointment objects and displays them as a list. It also displays a single Appointment component at any one time, whichever appointment is currently selected. The user can click on an Appointment and it will open up that appointment for viewing: