Getting Ready: Vending Machine
Explore the design of a vending machine by understanding its requirements, user interactions, payment handling, and inventory management. Learn to apply a bottom-up approach identifying core entities, handling system states, and integrating design patterns for a modular and extensible solution.
Problem definition
A vending machine is an automated self-service unit that provides users with products such as snacks, beverages, and chocolates. The machine contains multiple racks with products placed in slots. Users interact with the machine by inserting money, selecting the product they wish to buy, and receiving the selected item if the transaction is valid. The vending machine manages product dispensing based on the selection and payment, handles change, and maintains the state of its inventory.
In this LLD interview case study, you’ll focus on:
Managing the inventory of products using racks and slots within a vending machine.
Handling user interactions for inserting money, selecting products, and dispensing items.
Processing payments securely, including calculating and returning change for cash ...