Swift Object ModelLesson 28Free preview

Swift Polymorphism

This lesson is part of Swift · All levels

Summary

This lesson reviews the concept of polymorphism in Swift where objects from different subclasses can be treated as the same type of superclass. With dynamic dispatch, Swift calls for the implementation of the correct method according to the original instance type at runtime. This concept makes modular and extensible code design easier.

Key points

Polymorphism allows the manipulation of various derivative objects through a common interface type or superclass
Dynamic Dispatch ensures that the method being executed is a specific method belonging to the actual instance
Supports safe casting types 'as?' and 'is' to check the concrete object type
Can be applied through traditional class inheritance or through Protocol-Oriented Programming

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