compilation error when trying to create a new array

Question

Can you help me with 1 question please? I have erorr while try to create new array

Error text: "Cannot use instance member 'images' within property initializer; property initializers run before 'self' is available"

class ViewModel: ObservableObject {
    
    @Published var students: [StudentModel] = [
    StudentModel(name: "Roman", image: "bolt.fill"),
    StudentModel(name: "Ivan", image: "leaf.circle.fill"),
    StudentModel(name: "Denis", image: "ant.fill"),
    StudentModel(name: "Pavel", image: "pawprint.fill")
    ]
    
    @Published var names = ["Kirill","Mark","Vladimir","Andrew","Maksim","Igor","Petr", "Alexey"]
    
    @Published var images = ["bolt.fill", "leaf.circle.fill", "ant.fill", "pawprint.fill", "airtag.fill", "infinity.circle.fill"]
    
    var section: [StudentModel] = [StudentModel(name: names.randomElement() ?? "", image: images.randomElement() ?? "")]
    
    
    func addRow() {
        students.append(StudentModel(name: names.randomElement() ?? "", image: images.randomElement() ?? "" ))
        }

Thank you very much

You need to declare your var as lazy. lazy var section: [StudentModel] = [StudentModel(name: names.randomElement() ?? "", image: images.randomElement() ?? "")] — Leo Dabus
– Leo Dabus, Commented Jan 16, 2022 at 5:27

Yrb · Accepted Answer · 2022-01-15 22:35:23Z

2

When you are setting up your class, each property has to be initialized without a dependency on another property in that class., because until the whole thing is initialized, none of the properties are available yet.

You could do something like this:

var section: [StudentModel] = [
    StudentModel(
                name: ["Kirill","Mark","Vladimir","Andrew","Maksim","Igor","Petr", "Alexey"].randomElement() ?? "",
                image: ["bolt.fill", "leaf.circle.fill", "ant.fill", "pawprint.fill", "airtag.fill", "infinity.circle.fill"].randomElement() ?? "")
]

answered Jan 15, 2022 at 22:35

Yrb

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1 Comment

Leo Dabus Over a year ago

I wonder how this solution gets 2 votes up

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