SwiftUI List from JSON/Dictionary - json

Question

Just starting out with SwiftUI so apologies for the basic question. I have a dictionary created from a JSON file of the following format:
{
{
"first_name": "John",
"last_name": "Doe",
"email": "John.doe#domain.com"
},
{
"first_name": "Jane",
"last_name": "Doe",
"email": "Jane.doe#domain.com"
}
}
I would like to create a list of first_name that I can then use in other files, the names are unique so there shouldn't be any need for UUID. So far I can load my data into a swift file and display it with the use of:
struct DataTest: View {
let people = Bundle.main.decode("people.json")
var body: some View {
VStack{
ForEach(0 ..< people.count){number in
Text("\(people[number].first_name)")
}
}
}
}
Is there any way that I can generate an array or list without the use of a ForEach loop? I tied something like #State private var = people.first_name, but that did not seem to work.

Answer 1

Assuming that the is this structure:
struct Person {
var first_name : String
var last_name : String
var email: String
}
and people is [Person], you can map a single property like this:
let firstNamesOnly = people.map { $0.first_name }
or, newly in Swift 5.2:
let firstNamesOnly = people.map(\.first_name)
You could use this in a computed property and List by doing:
var firstNames : [String] {
people.map(\.first_name)
}
var body: some View {
VStack{
ForEach(firstNames, id: \.self) { firstName in
Text(firstName)
}
}
}