ReplaceConditionalLogicWithStrategy2.swift

final class Loan {
    var expiryDate: String?
    var maturityDate: String?
    private var capitalStrategy: CapitalStrategy
    
    private init(capitalStrategy: CapitalStrategy) {
        self.capitalStrategy = capitalStrategy
    }
    
    static func termLoan() -> Loan {
        return self.init(capitalStrategy: TermLoanCapitalStrategy())
    }
    
    static func revolver() -> Loan {
        return self.init(capitalStrategy: RevolverCapitalStrategy())
    }
    
    func capital() -> Double {
        return capitalStrategy.capital(loan: self)
    }
    
    func duration() -> Double {
        return 0.0
    }
    
    func getUnusedPercentage() -> Double {
        return 5.0
    }
}