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Protocol‘A protocol defines a blueprint of methods, properties, and other requirements that suit a particular task or piece of functionality. The protocol can then be adopted by a class, structure, or enumeration to provide an actual implementation of those requirements’다음에서 발췌: Apple Inc. ‘The Swift Programming Language (Swift 4.0.3).’ iBooks. https://itunes.apple.com/kr/book/the-swift-programm..

Well done is better than well said.기록은 기억을 지배한다.Swift Int값을 000의 자리마다 콤마를 넣어서 표현해보자.Swift4.0 2017.12.28 동작확인extension Int { private static var commaFormatter: NumberFormatter = { let formatter = NumberFormatter() formatter.numberStyle = .decimal return formatter }() var commaRepresentation: String { return Int.commaFormatter.string(from: NSNumber(value: self)) ?? "" } }대단하다.. 스택오버플로우 사람들..