strategy-pattern-1.swift

struct Logger {

    enum LogStyle {
        case lowercase
        case uppercase
        case capitalized
    }

    let style: LogStyle

    func log(_ message: String) {
        switch style {
        case .lowercase:
            print(message.lowercased())
        case .uppercase:
            print(message.uppercased())
        case .capitalized:
            print(message.capitalized)
        }
    }
}