gistfile1.swift

class CurrencyFactory 
{ 
  class func currencyForCountry(country:Country) -> Currency? 
  { 
    switch country 
    { 
      case .Spain, .France : 
        return Euro() 

      case .UnitedStates : 
        return UnitedStatesDolar() 

      default: return nil 
    } 
  } 
} 

let noCurrencyCode = "No Currency Code Available" 

CurrencyFactory.currencyForCountry(.Spain)?.code() ?? noCurrencyCode