Developing a Web Application Using Angular (Part 4)

In the previous article, we moved one step closer to our working web application by building our service provider layer that acts as an abstraction of our order management web service. With this foundation set, we are ready to complete the last layer in our web application: the User Interface (UI) layer.
Implementing the UI Layer
The first step in implementing our UI layer is to reflect upon the UI design we created in Part 1. In this design, we created two main components: (1) an order list component and (2) a save order component. While the latter component is abstracted into a single component, we are actually designing it to perform two separate tasks: (1) create a new order and (2) edit an existing order. This double-duty derives from the fact that components for creating a new order and editing an existing order look identical, with a few important caveats:

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