Dependency Inversion Bad Example

DI-bad-example.swift

struct User {
    let name: String
    let identifier: String
}

final class UserTransaction {
    private let dataBase: DataBase
    
    init(dataBase: DataBase) {
        self.dataBase = dataBase
    }
    
    func add(user: User) {
        dataBase.insert(user)
    }
    
    func edit(user: User) {
        dataBase.update(user)
    }
    
    func delete(identifier: String) {
        dataBase.delete(identifier: identifier)
    }
}