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https://docs.swift.org/swift-book/LanguageGuide/TypeCasting.html Type Casting — The Swift Programming Language (Swift 5.7) Type Casting Type casting is a way to check the type of an instance, or to treat that instance as a different superclass or subclass from somewhere else in its own class hierarchy. Type casting in Swift is implemented with the is and as operators. These tw docs.swift.org 타입 ..