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Lesson 5, “Objective-C Design Patterns,” covers the concept of design patterns and why it’s beneficial for developers to learn them. The lesson goes into the types of design patterns that exist in Objective-C and why they are important to understanding the language as a whole. Then, viewers are shown how to implement the Singleton design pattern in Objective-C, which is one of the most commonly used design patterns. After that, viewers learn about the Delegate pattern and the Observer pattern.