Firestore get array data at index 0 - swift

Question

Below I have some data in firestore.
I have a an array in the _geoloc field. Each of those indexes have latitude and longitude coordinates. So using SWIFT I want to be able to only get the lat and lng coordinates at index 0 and pass them to individually to a string. I have been researching for days and I am stuck. I have tried to create a new array of strings or an AnyObject array and I just get stuck with retrieving the data I need at index 0, and passing only those 2 lat/lng coordinates to string values. I have several failed snippets of code I could post.
Here is a snippet of what I was attempting to do: (I am really new to firebase so the code is a bit ugly as I am just trying to figure this out)
Firestore.firestore().collection("users").document("626").getDocument { (document, error) in
if let document = document {
// let geo_array = document["_geoloc"]
var yourArray = [String]()
// let geo_location = [geo_array] as [AnyObject]
let array: [Any] = document["_geoloc"] as! [Any]
let tmpArray = array.map({ return String(describing: $0)})
let string = tmpArray.joined(separator: ",")
yourArray.append(string)
print(yourArray[0])

Answer 1

You just need to cast your object from Any to an array of dictionaries and get the first property:
Firestore.firestore().collection("users").document("626").getDocument { document, error in
if let document = document {
var yourArray: [String] = []
if let location = (document["_geoloc"] as? [[String:Double]])?.first,
let latitude = location["lat"],
let longitude = location["lon"] {
let coordinate2d = CLLocationCoordinate2D(latitude: latitude, longitude: longitude)
yourArray.append("Latitude: \(location.latitude), Longitude: \(location.Longitude)")
}
}
}

Answer 2

Maybe first declare this:
var firstPositionValues = [AnyObject]()
Then get it like this:
let db = Firestore.firestore().collection("users").document("626")
db.getDocument { (document, error) in
if let document = document {
let geo_location = document["_geoloc"] as [AnyObject] // <- this is all of them in the document
var initialValues = geo_location[0] // <- here are your lat and lng at position 0
self.firstPositionValues = initialValues
}
Hope I understood correctly good luck.