Save User and getUsers

.swift

func saveUser(_ user:User) -> Bool  {
       
  var isSaved = false
        user.userId = UUID().uuidString
        
        var users = getUsers()
        users.append(user)
        
        let usersData = NSKeyedArchiver.archivedData(withRootObject: users)
        
        // save the user
        let userDefaults = UserDefaults.standard
        userDefaults.setValue(usersData, forKey: "users")
        userDefaults.synchronize()
        isSaved = true
        
        return isSaved
    }
    
    func getUsers() -> [User] {
        
        let userDefaults = UserDefaults.standard
        let usersData = userDefaults.value(forKey: "users") as? Data
        if usersData == nil {
            return [User]()
        }
    
        let users = NSKeyedUnarchiver.unarchiveObject(with: usersData!) as! [User]
        return users
    }