Json as array Type ?

Question

Created May ’19

Replies 2

Boosts 0

Participants 2

Is this possible ? ...

static func loadJSON<T>(_ url: URL, arrayType: T.Type)
let json_array: [AnyObject] = try JSONDecoder().decode(Array<T>.self, from: json_data)

Trying to make my loading func a bit more dynamic.

Answered by OOPer in 360693022

The code should work as expected (though it is not clear enough what you expect) only if `T` is `Decodable`:

    static func loadJSON<T: Decodable>(_ url: URL, arrayType: T.Type) {
        do {
            let json_data = Data()
            //...
            let json_array: [T] = try JSONDecoder().decode(Array<T>.self, from: json_data)
            //...
        } catch {
            print(error)
            //...
        }
    }

But what do you expect with this code? Generic parameters are resolved statically and it may not be so dynamic.

Boost

Answer 1

OOPer OP

May ’19

Accepted Answer

The code should work as expected (though it is not clear enough what you expect) only if `T` is `Decodable`:

    static func loadJSON<T: Decodable>(_ url: URL, arrayType: T.Type) {
        do {
            let json_data = Data()
            //...
            let json_array: [T] = try JSONDecoder().decode(Array<T>.self, from: json_data)
            //...
        } catch {
            print(error)
            //...
        }
    }

But what do you expect with this code? Generic parameters are resolved statically and it may not be so dynamic.

0

Answer 2

Pendragon OP

May ’19

Works with <T: Codable> thank you. 🙂

0