LazySwift.swift

class ViewController : UIViewController, MKMapViewDelegate {
    /**
    Create lazy property to the map view, initializing it with 
    the convenience init function  described in the class 
    extension above
    */
    lazy var mapView:MKMapView = MKMapView { m in
        m.delegate = self
        m.showsUserLocation = true
        
        // Do some other lazy init-related operation..
    }
}