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## Factory
Factory method is a creational design pattern which solves the problem of creating product objects without specifying their concrete classes.
- [Factory Method in Swift](https://refactoring.guru/design-patterns/factory-method/swift/example)
- [The Factory Pattern using Swift](https://stevenpcurtis.medium.com/the-factory-pattern-using-swift-b534ae9f983f)
## Observer
Observer is a behavioral design pattern that allows some objects to notify other objects about changes in their state.