How to get firstindex of array in struct Swift

Question

Hi I have a struct like this

struct OrderCaches: Codable {
    var food, drink: [Food]?
}


struct Food: Codable{
    var id: Int?
    var name: String?
    var quantity: Double?
    var notes: String?
}

I want to get first index where id = productList[indexPath.row].id

I tried with:

let index = OrderCaches.firstIndex(where: {$0.food.id == productList[indexPath.row].id})

but not work I get this error "Value of type '[Food]?' has no member 'id'". How can I get the first Index? Thanks

The types here are really suspicious. What does it mean to have a `nil` quantity of a an unnamed `Food` with no ID or notes? Because that's currently possible given the types of the fields of `Food`, but it doesn't make any sense in real life — Alexander, May 25 '20 at 22:01

score 2 · Accepted Answer · answered May 25 '20 at 21:39

2

The function firstIndex is not a static member, but an instance member, hence you have to create an instance of OrderCache to get the index, like below:

let orderCaches = OrderCaches(food: [], drink: [])
let index = orderCaches.food?.firstIndex(where: { $0.id == productList[indexPath.row].id })

answered May 25 '20 at 21:39

Frankenstein

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sorry i just realise you posted the same solution before me .. so deleted mine – Jawad Ali May 25 '20 at 21:46
@jawadAli Oh, that's fine. It's always good to have a second opinion, happy coding. – Frankenstein May 25 '20 at 21:51
I found a solution. My mistake was that I have create a variable of type [OrderCaches]. Now variable is of type "OrderCaches", now it works. Thanks for solutions – TheCesco1988 May 25 '20 at 21:53

How to get firstindex of array in struct Swift

1 Answers1