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Book Overview & Buying
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Table Of Contents
Mastering Swift 6 - Seventh Edition
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In this chapter, we explored how powerful protocols and protocol extensions are in Swift, beginning with an introduction to protocols as full-fledged types. We saw their importance in providing standard interfaces for multiple types, demonstrated through the use of polymorphism, and examined typecasting using the is and as keywords, illustrating conditional casting and type filtering techniques.
We then looked at protocol extensions, and their role in providing default method and property implementations. We saw how using protocol extensions reduces code duplication and enhances maintainability compared to traditional protocol implementation. The concepts of Any and any were also covered, distinguishing their use in representing instances of any type and marking existential types, and discussing their impact on performance.
Finally, we looked at synthesized implementations for protocols like Equatable, Hashable, and Comparable. This illustrated how Swift can automatically...