为什么数据返回nil？

Question

I am trying to access the data within an object, but I am getting a nil when I print it. Why is that happening and how do I fix it?

 print("card \(success!["data"]!!["brand"])")

Answer 1

guard let success = result as? [String: AnyObject] else { return }
let data = success["data"] as! [AnyObject]
let firstObject = data.first! as! [String: AnyObject]
print(firstObject["brand"] as! String)