Locale+regionalIndicatorSymbol.swift

extension Locale {
    /// An emoji representation of the locale's region.
    var emoji: String? {
        return regionalIndicatorSymbol
    }
    
    /// The regional indicator symbols are a set of 26 alphabetic Unicode characters (A–Z) intended to be used to encode
    /// ISO 3166-1 alpha-2 two-letter country codes in a way that allows optional special treatment.
    ///
    /// These were defined as part of the Unicode 6.0 support for emoji, as an alternative to encoding separate characters for each
    /// country flag. Although they can be displayed as Roman letters, it is intended that implementations may choose to display them
    /// in other ways, such as by using national flags. The Unicode FAQ indicates that this mechanism should be used and that
    /// symbols for national flags will not be directly encoded.
    ///
    /// See: https://en.wikipedia.org/wiki/Regional_Indicator_Symbol
    var regionalIndicatorSymbol: String? {
        guard let regionCode = self.regionCode else { return nil }
        let base: UInt32 = 127397
        return regionCode.unicodeScalars.compactMap { String.init(UnicodeScalar(base + $0.value)!) }.joined()
    }
}