Swift's protocols are powerful tools for defining contracts that types can conform to. They allow us to specify what capabilities a type must have without dictating how those capabilities are implemented. This core principle is fundamental to building flexible and testable architectures in Swift.
However, protocols alone can sometimes lead to boilerplate. What if many types conforming to a protocol share common behavior for a particular requirement? Or what if you want to add new, optional functionality to an existing protocol without…
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