올해 크리스마스는 무슨 요일일까?

xmas.swift

/* 결과보기 : http://swiftstub.com/345157923 */

enum Weekday: Int, CustomStringConvertible {
    case Sun = 1
    case Mon, Tue, Wed, Thu, Fri, Sat
    
    var description: String {
        switch self {
        case .Sun: return "Sunday"
        case .Mon: return "Monday"
        case .Tue: return "Tuesday"
        case .Wed: return "Wedenesday"
        case .Thu: return "Thursday"
        case .Fri: return "Friday"
        case .Sat: return "Saturday"
        }
    }
    
}

func whatIsTheDayOfThisChristmas() {
    
    if let cal = NSCalendar(identifier: NSCalendarIdentifierGregorian),
        case let thisYear: Int = 
            cal.components([.Year], fromDate:NSDate()).year {
                
        let comps = NSDateComponents()
        comps.year = thisYear
        comps.month = 12
        comps.day = 25
        
        let christmas = cal.dateFromComponents(comps)!
        let c = cal.components([.Day, .Weekday], fromDate:christmas)
        
        print(Weekday(rawValue: c.weekday)!)
    }
    
}

whatIsTheDayOfThisChristmas()