import std.stdio : writeln;

​

class Event {}

​

class EventTarget

{

    void addEventListener(string eventName, void delegate(Event event) callback)

    {

        // TODO: add to slice to execute later, for now execute directly

        callback(new Event());

    }

}

​

void main()

{

    auto variableFromParentScope = "lorem ipsum";

    auto target = new EventTarget();

    target.addEventListener(

        "load", 

        (Event event) {

            writeln(variableFromParentScope, event);

        }

    );

}