Network Layer with Alamofire

NetworkManager.swift

static func request(urlRequest: URLRequest, completion: (DataResponse) -> (Void), failure: (Data) -> (Void)) {
    let request = Alamofire.request(urlRequest)
        .validate()
    request.validate().responseJSON {response in
        if (200..<300) ~= response.response?.statusCode {
            completion(response.result)
        } else {
            failure(response.data)
        }
    }

    return response
}