developer.apple.com/documentation/swift/optional
Apple Developer Documentation
developer.apple.com
A Beginner's Guide to Optionals in Swift
Two weeks ago, we covered the basics of Swift. In coming weeks, we'll write a series of tutorials to cover a number of new features in Swift. This week, let's
www.appcoda.com
swift3 ) Optional 개념 정리
안녕하세요 :) 오늘은 Optional이 뭔지에 대해 정리해볼려고해요. 이것도 yagom님이 BoostCamp강의에서 설명을 엄청 잘해주셨답니다 :) yagom님 강의를 토대로 추가할 부분은 추가해가면서 정리해볼게요
zeddios.tistory.com
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