Closures, also known as “anonymous methods” in Delphi, are now supported by DWScript for the JavaScript CodeGen, with the same syntax as in Delphi:

myObject.MyEvent := procedure (Sender : TObject);
                    begin
                       ...
                    end;

There are of course some extensions that go beyond what Delphi supports 😉

You are allowed to use a named local procedure as a closure / anonymous method, with optional capture of local variables, allowing for neater layout of code, for instance:

begin
   ...
   procedure MyLocalProc(Sender : TObject);
   begin
      ...
   end;
   ...
   myObject.MyEvent := MyLocalProc;
   ...
end;

The function pointers and closures are unified, you did not have to distinguish between a “procedure” and a “procedure of object“, and you don’t have to distinguish a “reference to procedure” either, ie. if you declare

type TNotifyEvent = procedure (Sender : TObject);

as long as the parameters match (and result type for a function) , the above type will accept standalone functions, object methods, interface methods, and now closures/anonymous methods (and even record methods, which are just syntax sugar for standalone function with an implicit parameter).

PS: DWScript (as a scripting engine), will very likely evolve (in time) from a stack based-engine to a closure-based engine, so the above syntax will be supported for scripting purposes too, and not just when compiling to JavaScript.