We want to sell tills to local hipster coffee shop who are finally embracing the 21st century. We need a new till to replace their vintage machines - unfortunately, hipster staff are too cool to learn a new system, so we need you to build something that they will understand.
Please see bottom of page for comments
This is what a sample receipt looks like:
Implement a system that contains the business logic to produce receipts similar to this, based on a json price list and test orders. A sample .json file has been provided with the list of products sold at this particular coffee shop.
Here are some sample orders you can try - whether you use this information is up to you:
Jane
2 x Cafe Latte
1 x Blueberry Muffin
1 x Choc MudcakeJohn
4 x Americano
2 x Tiramisu
5 x Blueberry Muffin
Your receipt must calculate and show the correct amount of tax (in this shop's case, 8.64%), as well as correct line totals and and total amount. Do not worry about calculating discounts or change yet. Consider what output formats may be suitable.
- Add functionality to take payment and calculate correct change.
- Add functionality to handle discounts - in this example, a 5% discount on orders over $50, and a 10% muffin discount.
Implement an user interface that can actually be used as a till.
You may use whatever technologies you see fit.
- I would double for all tests and stub methods where neccessary as I think this would make me think more carefully about how different classes are interacting
- I would not use float to represent the prices as this causes the need for lots of rounding and I have been reading about possible problems with this. I have seen there are some relevant gems I could use to monetise values.
- Make adjustments a module instead of a class, I kept it as a class because I wanted to have the initialized variables easily accessible, but really it is just doing calculations and perhaps these details should belong elsewhere
- I struggled to keep my controller skinny for the receipt page as there were lots of variables I needed to render on the page. I managed to extract some of the logic to the till, but I would also split that out to another class if I had time.