samirGuerdah

protocol Loadable {
    var activityIndicator: UIActivityIndicatorView {get}
    func showLoaderView()
    func hideLoaderView()
}

extension Loadable where Self: UIViewController {
    
    func showLoaderView() {
        activityIndicator.translatesAutoresizingMaskIntoConstraints = false

samirGuerdah

extension Array {
  
   func sg_flatMap<U>(transform: (Generator.Element) -> [U]) -> [U] {
   
      var result = [U]()
      for item in self {
         result.appendContentsOf(transform(item))
      }
      return result
   }

samirGuerdah

extension Array {
   func map<U>(transform: (element: Generator.Element) -> U) -> [U]{
      var elements = [U]()
      for item in self {
         elements.append(transform(element: item))
      }
      return elements
   }
}