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extension Bool {
    mutating func toggle() {
        self = !self
    }
}

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class ViewController: UIViewController {

    let viewModel = ViewModel()
    var jobs = [Job]()

    @IBOutlet weak var tableView: UITableView!
    override func viewDidLoad() {
        super.viewDidLoad()

        viewModel.getJobs(closure: { [unowned self] (result) in

dmlebron

class ViewController: UIViewController {

    let viewModel = ViewModel()
    var jobs = [Job]()

    @IBOutlet weak var tableView: UITableView!
    override func viewDidLoad() {
        super.viewDidLoad()

        viewModel.getJobs(closure: { (result) in

dmlebron

class ViewController: UIViewController {

    let viewModel = ViewModel()
    var jobs = [Job]()

    @IBOutlet weak var tableView: UITableView!
    override func viewDidLoad() {
        super.viewDidLoad()

        viewModel.getJobs(closure: { (result) in

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enum ViewModelError: Error {
    case urlError(String)
    case apiClientError(ApiClientError)
}

final class ViewModel {

    typealias Closure = (Result) -> ()

    enum Result {

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enum Constants {
    static let jobsUrl = "https://jobs.github.com/positions.json"
}

enum ApiClientError: Error {
    case jsonFormat(String)
    case responseError(String)
}

final class ApiClient {

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func get(url: URL, closure: @escaping Closure)

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typealias Closure = (Response) -> ()

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enum Response {
    case result([Job])
    case error(ApiClientError)
}

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protocol ApiClientDelegate {
    func didFinishLoadingWithJobs(_ jobs: [Job]?)
    func didFailedLoadingWithError(_ error: ApiClientError)
}