BuilderPattern for creating multiple type of objects using struct for model

BuilderPatternWithOptionalsUsingStruct.swift

struct OptionDetailDataStruct: Equatable {
    let isExpired: Bool
    let expiryDate: String?
    let cardNumber: String?
    let formattedNumber: String?
    let phoneNumber: String?
}

class OptionDetailDataBuilderStruct {
    private var isExpired: Bool = false
    private var expiryDate: String?
    private var cardNumber: String?
    private var formattedNumber: String?
    private var phoneNumber: String?
    
    func set(isExpired: Bool) -> OptionDetailDataBuilderStruct {
        self.isExpired = isExpired
        return self
    }
    
    func set(expiryDate: String) -> OptionDetailDataBuilderStruct {
        self.expiryDate = expiryDate
        return self
    }
    
    func set(cardNumber: String) -> OptionDetailDataBuilderStruct {
        self.cardNumber = cardNumber
        return self
    }
    
    func set(formattedNumber: String) -> OptionDetailDataBuilderStruct {
        self.formattedNumber = formattedNumber
        return self
    }
    
    func set(phoneNumber: String) -> OptionDetailDataBuilderStruct {
        self.phoneNumber = phoneNumber
        return self
    }
    
    func build() -> OptionDetailDataStruct {
        return OptionDetailDataStruct(isExpired: isExpired, expiryDate: expiryDate, cardNumber: cardNumber, formattedNumber: formattedNumber, phoneNumber: phoneNumber)
    }
}


let data1 = OptionDetailDataBuilderStruct()
    .set(isExpired: false)
    .set(expiryDate: "Today")
    .set(formattedNumber: "****1234****")
    .set(phoneNumber: "9876543210")
    .set(cardNumber: "441122224411")
    .build()

let walletMetadata1 = OptionDetailDataBuilderStruct()
    .set(phoneNumber: "9876543210")
    .build()

print(walletMetadata.phoneNumber)