Restaurant, Menu, Order classes in LLD - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the main responsibility of the Restaurant class in a system design?

The Restaurant class manages the overall restaurant details, including its name, location, and the menus it offers. It acts as a container for menus and handles operations like adding or removing menus.

beginner

What does the Menu class typically represent and contain?

The Menu class represents a collection of MenuItems offered by the restaurant. It contains details like the menu name (e.g., Breakfast, Dinner) and a list of MenuItems with their prices and descriptions.

beginner

What is the role of the Order class in the system?

The Order class tracks customer orders. It contains ordered items, quantities, order status (e.g., pending, completed), and calculates the total price. It connects the customer choices to the restaurant's menu.

intermediate

How do the Restaurant, Menu, and Order classes interact in a typical flow?

The Restaurant holds multiple Menus. Each Menu has MenuItems. When a customer places an Order, it references MenuItems from a Menu in the Restaurant. The Order calculates totals based on MenuItem prices.

intermediate

Why is it important to separate Menu and Order classes in system design?

Separating Menu and Order classes allows independent management of the menu (items and prices) and customer orders. This separation supports scalability, easier updates to menus, and clear tracking of orders without mixing concerns.

Which class should contain the list of available dishes in a restaurant system?

A Restaurant

B Order

C Menu

D Customer

The Menu class holds the list of available dishes (MenuItems) offered by the restaurant.

What does the Order class primarily track?

A Employee schedules

B Restaurant location details

C Menu item prices

D Customer orders and their status

The Order class tracks customer orders, including items ordered and their status.

If you want to add a new dish to the restaurant, which class should you update?

A Invoice

B Menu

C Restaurant

D Order

New dishes are added to the Menu class as MenuItems.

Which class is responsible for calculating the total price of an order?

A Order

B Menu

C Restaurant

D Payment

The Order class calculates the total price based on the ordered MenuItems and their quantities.

Why should Menu and Order be separate classes?

A To keep menu management and order tracking independent

B To combine all data in one place

C To reduce the number of classes

D To avoid using databases

Separating Menu and Order keeps menu management and order tracking independent, improving clarity and scalability.

Explain how the Restaurant, Menu, and Order classes work together in a restaurant system.

Think about how a customer chooses items and places an order.

Describe why separating concerns between Menu and Order classes is beneficial in system design.

Consider what would happen if menu and orders were mixed in one class.