okuye/cafex

DDC Recruitment Exercise

Scenario

Cafe X menu consists of the following items:

• Cola - Cold - 50p
• Coffee - Hot - £1.00
• Cheese Sandwich - Cold - £2.00
• Steak Sandwich - Hot - £4.50

Customers don’t know how much to tip and staff need tips to survive!

Step 1 : Standard Bill

Pass in a list of purchased items that produces a total bill.

e.g. [“Cola”, “Coffee”, “Cheese Sandwich”] returns 3.5

Step 2: Service Charge

Add support for a service charge :

• When all purchased items are drinks no service charge is applied
• When purchased items include any food apply a service charge of 10% to the total bill (rounded to 2 decimal places)
• When purchased items include any hot food apply a service charge of 20% to the total bill with a maximum £20 service charge

Assumptions

The data type of the the food price is selected as BigDecimal as opposed to using a DomainObject such as Money. This is because BigDecimal is better in rounding (https://alvinalexander.com/scala/scala-money-currency-bigdecimal-class-libraries) The code ignores the non-available menu items and continues processing.