Load JSON with no lib

loadJSONClassic.swift

do {
    guard let url = NSBundle.mainBundle().URLForResource("sample", withExtension: "json"),
        let JSONData = NSData(contentsOfURL: url),
        let json = try NSJSONSerialization.JSONObjectWithData(JSONData, options: NSJSONReadingOptions()) as? Array<AnyObject> else
    {
        print("Sample.json not found")
        return
    }

    for item in json  {
        guard let user = item as? [String: AnyObject],
            let id = user["id"] as? Int,
            let name = user["name"] as? String,
            let weight = user["weight"] as? Double else {
                print("Unable to read json object")
                return
        }
        print("\(id) : \(name)'s weight is \(weight)")
        data.append("\(id) : \(name)'s weight is \(weight)")
    }
} catch {
    print(error)
    return
}