The main objective of this course project is to design and implement a simple ordering system utilizing some of the programming concepts and paradigms in F# and Python programming. This is an example case study where we consider VIA Canteen that sells some products such as food, fruits, and drinks. For now, orders are taken in-house by order entry personnel. However, some of its customers come from outside (like the SOSU or other buyers using the train station). On a closer look, VIA canteen realizes that it cannot be effectively run with its current setup and therefore needs a new online order management system (with a new name Goodies To Go - G2G).
Currently, G2G offers drinks, food, and fruits. Further, it is considering adding to its product line in-demand take-away goodies, room delivery on the campus and other products that are not just food, fruit, and drinks. G2G is very ambitious; it hopes to open a more order- processing location on other VIA Campuses within the next one year.
Our goal is to design and implement a system that not only meets G2G’s immediate needs but also is flexible enough to support other types of products in the future. The solution will allow customers (for instance, VIACustomer, SOSUCustomer) to order goodies through their computer (or mobile phone). Below is a simple conceptual domain model showing some of the objects.
**Figure 1: Conceptual domain model.
To develop this application, a simple domain-specific language for describing the objects, products and all the different categories of drinks, food, and fruits as well as computing the prices need to be developed.
In this “first sprint” of the project, you will define data types to model the domain of the application as shown in the conceptual domain in model above. The task is to define the different types of drinks, food, and fruits in the café (canteen) and implement the price computing function. You need to decide for yourself the prices for the different drinks. For instance, the drinks can be different types of coffee, tea, juice, soda, milk, together with their corresponding sizes (Small, Medium, and Large) and should have different prices.
The types should have at least:
- 3 different types of coffee drink
- 3 different types of tea drink
- 3 different types of juice drink
You will be computing the different prices for the above drinks depending on the type and size of the drink. The same will be repeated for the food and drinks.
Sprint 1 – F# Domain Driven Development
You are allowed to develop your own strategy for describing the domain objects and the different drinks together with their sizes as well as functions that compute the prices for a given type of drink, food, or fruit.
As a minimum, you should define a simple data type for describing the different drinks, food, 
and fruits and then implement a function to compute the price.
Hints: You will need to define the data type for drinks (using union) and the three chosen categories, for instance, coffee or tea or juice together with the size (using record). You will also need to define the price computation function that uses pattern matching.
PCL1 3/3 