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func push(_ module: Presentable?)

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class BaseCoordinator {
  var childCoordinators: [Coordinator] = []
  
  // add only unique object
  func addDependency(_ coordinator: Coordinator) {
    for element in childCoordinators {
      if element === coordinator { return }
    }
    childCoordinators.append(coordinator)
  }

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func runCreationFlow() {
  let (coordinator, module) = coordinatorFactory.makeItemCoordinatorBox()
  coordinator.finishFlow = { [weak self, weak coordinator] item in
    self?.router.dismissModule()
    self?.removeDependency(coordinator)
    self?.showItemDetail(item)
  }
  addDependency(coordinator)
  router.present(module)
  coordinator.start()

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func showItemList() {
    let itemsView = factory.makeItemsView()
    itemsView.onItemSelect = { [weak self] (item) in
      self?.showItemDetail(item)
    }
    itemsView.onCreateButtonTap = { [weak self] in
      self?.runCreationCoordinator()
    }
    router.setRootModule(itemsView)
}

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final class ItemCoordinator {
  private let factory: ItemModuleFactory
  private let coordinatorFactory: CoordinatorFactory
  private let router: Router
  
  init(router: Router,
       factory: ItemModuleFactory,
       coordinatorFactory: CoordinatorFactory) {
    self.router = router
    self.factory = factory

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protocol CoordinatorOutput {
    var finishFlow: (Item -> Void)? { get set }
}

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protocol Coordinator: class {
    func start()
}

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func prepare(for segue: UIStoryboardSegue, sender: Any?) {
  if segue.identifier == "openControllerA" {
    let vc = segue.destinationViewController as! ControllerA
    vc.monkey = 🐒
  } else if segue.identifier == "openControllerB" {
    let vc = segue.destinationViewController as! ControllerB
    vc.tiger = 🐯
  } else if segue.identifier == "openControllerC" {
    let vc = segue.destinationViewController as! ControllerC
    vc.frog = 🐸

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func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        if 🍌🍌 {
            router.openControllerA()
        } else if 🍌🍌🍌 {
            router.openControllerB()
        } else if 🍐  {
            router.openControllerC()
        } else if 🍐🍐 {
            router.openControllerD()
        }

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// Compile with clang -framework Foundation sethack.m

#import <Foundation/Foundation.h>
#import <objc/runtime.h>

/*
 CFHashBytes from http://www.opensource.apple.com/source/CF/CF-1153.18/CFUtilities.c
 */
#define ELF_STEP(B) T1 = (H << 4) + B; T2 = T1 & 0xF0000000; if (T2) T1 ^= (T2 >> 24); T1 &= (~T2); H = T1;