Key Insights and Tips: Designing a Vending Machine

You’ve completed the “Designing a Vending Machine” case study. This lesson builds on that experience by exploring common design pitfalls and providing targeted guidance for interview scenarios. To help reinforce your understanding, a short quiz and a list of related case studies are included, focusing on similar design principles.

Common mistakes

Avoiding these common mistakes will help you develop a more efficient and scalable Vending Machine system:

• Not using the State pattern: Failing to manage the distinct states of the vending machine (e.g., NoMoneyInserted, MoneyInserted, Dispense) leads to complex and hard-to-maintain conditional logic. You should implement the State design pattern to encapsulate ...