Swift: array check for object at index - arrays

Question

I have an data model object with several properties. I have a dynamic array that will sometimes have some but not all of the object properties inside of it.
How do I safely check if the array as anything at it's index
DataModel
class Order{
var item0:String?
var item1:String?
var item2:String?
}
Array:
var myArray = [String]()
The guard statements are where I'm having issues checking to see if there are elements inside the array at different indexes.
Btw the array will never have more then 3 elements inside of it.
let order = Order()
order.item0 = "hat"
order.item1 = "sneakers"
myArray.append(order.item0)
myArray.append(order.item1)
//sometimes there may or may not be item2
let placedOrder = Order
//These guard statements aren't working
guard case let placedOrder.item0 = myArray[0] else {return}
guard case let placedOrder.item1 = myArray[1] else {return}
//There isn't anything at myArray[2] but I need to safely check anyway
guard case let placedOrder.item2 = myArray[2] else {return}

Answer 1

1st The array should hold the data model type and not it's properties:
var orders = [Order]()
//changed the array's name from myArray to orders instead
2nd Add the data model object to the array:
let orderOne = Order()
orders.append(orderOne)
3rd loop through the array, check that the element's properties aren't nil:
for order in orders{
if order.item0 != nil{
//do something with order.item0
}
if order.item1 != nil{
//do something with order.item1
}
if order.item2 != nil{
//do something with order.item2
}
}