Structural Patterns

• Facade
• Adapter Pattern
• Repository Design Pattern

How objects relate to eachother

Purpose: Organizing classes and objects into larger structures to simplify relationships and ensure flexible and efficient composition

Code Example - Decorator Pattern

class Coffee:
    def cost(self):
        return 5

class MilkDecorator:
    def __init__(self, coffee):
        self._coffee = coffee

    def cost(self):
        return self._coffee.cost() + 2

class SugarDecorator:
    def __init__(self, coffee):
        self._coffee = coffee

    def cost(self):
        return self._coffee.cost() + 1

# Usage
coffee = Coffee()
coffee = MilkDecorator(coffee)
coffee = SugarDecorator(coffee)

print(coffee.cost())  # Output: 8