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https://docs.swift.org/swift-book/LanguageGuide/TheBasics.html The Basics — The Swift Programming Language (Swift 5.6) The Basics Swift is a new programming language for iOS, macOS, watchOS, and tvOS app development. Nonetheless, many parts of Swift will be familiar from your experience of developing in C and Objective-C. Swift provides its own versions of all fundamental docs.swift.org 값이 비어있을 ..