Configuring a Constant Using Shorthand Argument Labels

ConstantShortHand.swift

// See https://www.natashatherobot.com/swift-configuring-a-constant-using-shorthand-argument-names/ for more info.

public enum TaxiServiceType:CustomStringConvertible
{
    case Uber
    case BlackCab
    
    public var description: String {
        switch  self {
        case .BlackCab:
            return "Black Cab"
        case .Uber:
            return "Uber"
        }
    }
}

public class TaxiService:CustomStringConvertible
{
    private var serviceTypeInternal: TaxiServiceType
    public var serviceType: TaxiServiceType {
        get {
            return self.serviceTypeInternal
        }
    }
    
    private var maximumFare:Float
    
    public init!(forServiceType type:TaxiServiceType)
    {
        self.serviceTypeInternal = type
        self.maximumFare = 0.0
    }
    
    public func setPreferredMaxFare(fare:Float)
    {
        maximumFare = fare
    }
    
    public var description: String {
        let formatter = NSNumberFormatter()
        formatter.numberStyle = .CurrencyStyle
        formatter.currencySymbol = "$"
        let fare = formatter.stringFromNumber(NSNumber(float: maximumFare))!
        
        return "You've selected a \(serviceType) service with a maximum fare of \(fare)"
    }
    
}

let tService:TaxiService =  {
    $0.setPreferredMaxFare(23.00)
    return $0
}(TaxiService(forServiceType: .BlackCab))

print(tService.description) // You've selected a Black Cab service with a maximum fare of $23.00