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struct User {
    var username = ""
}

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import ws
import then

let api = Api()

struct Api {
    
    private let ws = WS("http://jsonplaceholder.typicode.com")
    
    func getUsers() -> Promise<[User]> { // We want [User] back!

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import UIKit

class ViewController: UIViewController {
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        api.getUsers().then { users in
            for u in users {
                print(u.username)

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api.getUsers().then { users in
  // strongly typed [User] !
}.onError { e in
    print(e) // Handle any networking error that might happen
}.finally {
    print("Whatever happens I'll be executed ")
}

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tableView.register(MyCell.self, forCellReuseIdentifier: “MyCell”)

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protocol Reusable: class {
  static var reuseIdentifier: String { get }
}

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extension MyCell: Reusable {}

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extension Reusable {
  static var reuseIdentifier: String {
    return String(describing: Self.self)
  }
}

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extension UITableView {
  func register<T: UITableViewCell>(_: T.Type) where T: Reusable {
    register(T.self, forCellReuseIdentifier: T.reuseIdentifier)
  }
}

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tableView.register(Mycell.self)