Webservice loadSources Function

.swift

  func loadSources(completion :@escaping ([Source]) -> ()) {
        
        URLSession.shared.dataTask(with: sourcesURL) { data, _, _ in
            
            if let data = data {
                
                let json = try! JSONSerialization.jsonObject(with: data, options: [])
                let sourceDictionary = json as! JSONDictionary
                let dictionaries = sourceDictionary["sources"] as! [JSONDictionary]
                
                let sources = dictionaries.flatMap(Source.init)
                
                DispatchQueue.main.async {
                    completion(sources)
                }
            }
            
        }.resume()
        
    }