For-in loop requires '[UserVehicles]?' to conform to 'Sequence'; did you mean to unwrap optional? Swift

I have a data model which I made for API returns, it is something like this:

```
struct VehicleData: Codable {

let _embedded: Embedded

}

struct Embedded: Codable {
let userVehicles: [UserVehicles]
}


struct UserVehicles: Codable {
let id: String
let images: [String]
let userId: String
let vehicle: Vehicle
let originalPrice: OriginalPrice
let hasBasicInsurance: Bool

}

```

I have used callback function to pass it to my ViewController, now I want to get check in the useVehiclers list, how many vehicles hasBasicInsurance. basically, ```vehicleList?._embedded.userVehicles[i] = true```

this is my function code to use the vehicle data in ViewController:

```
var vehicleManager = VehicleManager()
var vehicleList: VehicleData?
var i: Int = 0

@IBOutlet weak var tableView: UITableView!

override func viewDidLoad() {
super.viewDidLoad()

vehicleManager.retrieveUserVehicle()
vehicleManager.onDataUpdate = { [weak self] (data: VehicleData) in
self?.useData(data: data)
}

tableView.dataSource = self
tableView.delegate = self
tableView.tableFooterView = UIView() //remove empty tableView cells
tableView.register(UINib(nibName: Constants.vehicleListCellNibName, bundle: nil), forCellReuseIdentifier: Constants.vehicleListToBeInsuredIdentifier)

}

func useData(data: VehicleData) {
vehicleList = data

// code below has issues....
for i in [vehicleList?._embedded.userVehicles] {

if let vechile = vehicleList?._embedded.userVehicles[i].hasBasicInsurance {
if vehicle == true {
i = i + 1
print(">>number of of insured vehidle: \(i)")
} else {
print(">>>number of of insured vehidle: \(i)")
}
}



}

}

```
[![enter image description here][1]][1]

Do you know how to fix it?


[1]:

You can also use for_each loop for this, for eg like this:



vehicleList?._embedded.userVehicles.for_each(x in /*Do your thing here*/)

It's not clear from your code, but it looks like `vehicleList` is optional. It probably should not be (see Leo Dabus's comments). It is rare that it makes sense to have an optional array. That suggests there's some difference between an empty array and a missing array. If there is, then that's fine, but in most cases you should just use a non-optional array and make it empty.

Whether you fix that or not, the solution to this particular problem is to just use a non-optional value, and you have one: `data`. So change the loop to:

for i in data._embedded.userVehicles { ... }

---

From your updated question, you note "I want to get check in the useVehiclers list, how many vehicles hasBasicInsurance." It seems you want to put that value in `i`. If so, that would be:

func useData(data: VehicleData) {
vehicleList = data
i = data._embedded.userVehicles
.filter(\.hasBasicInsurance)
.count
}

You need to supply a default value for optional as a good practise instead of force unwrap

for i in vehicleList?._embedded.userVehicles ?? [] { }