Interfaces

You saw an example of implementing an interface in the previous lesson. You can read more about interfaces here—what they are for, why you might want to write one, and how to write one.

1. Interfaces
   

   Using interfaces to design contracts that spells out how their software interacts.

2. Implementing an Interface
   

   Using interfaces to design contracts that spells out how their software interacts.

3. Using an Interface as a Type
   

   An interface defines a type.

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