Code Quiz

Fetching JSON With URLSession dataTask

Spot the subtle mistake that stops this URLSession REST fetch from ever running.

Codeswift

struct User: Decodable { let id: Int; let name: String }

func fetchUser(completion: @escaping (User?) -> Void) {
    let url = URL(string: "https://api.example.com/user/1")!
    let task = URLSession.shared.dataTask(with: url) { data, response, error in
        guard let data = data, error == nil else {
            completion(nil)
            return
        }
        let user = try? JSONDecoder().decode(User.self, from: data)
        completion(user)
    }
}

What is the bug in this code?

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