1. What is the delegation pattern ? It is an object-oriented design pattern that allows object composition to achieve the same code reuse as inheritance.

2. Why should I use it ? Because it increases scalability, maintainability, reusability, testability, among others.

3. How do I know what can be refactored into a delegate ?

• UI unrelated stuff (for example, tipping, total product price from checkout in cornershop app)
• UI reusable stuff (for example, address selector which already exists)
• Cohesion between methods and dependencies. You may notice that some methods only use a group of dependencies, these dependencies can be extracted into a delegate