Restaurant Order Management Interfaces | Dataford Interview Questions

An order management system for a restaurant is being developed, Implement the IOrder and IOrder System interface as described.

Implement an order abstraction and an order-system abstraction that can add or remove order items, list items with quantities, and calculate the total after applying discounts by price category: Cheap, Moderate, and Expensive.

Input and Output

Use process_orders(operations, discounts). Each item has id, name, price, and category. Operations are add, remove, list, or total. An add operation includes item and quantity; a remove operation includes id and quantity. Return one result per operation: null for mutations, a list for list, and the discounted numeric total for total.

Constraints

Each item has id, name, price, and category fields.
Item IDs are unique within an order.
Quantities are positive integers.
A remove operation references an existing item.
Discount values are decimal rates between 0 and 1.
At most one item record exists for each ID.

Function Signature

def process_orders(operations, discounts):

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