Delphi #IF(DEBUG) equivalent?

Question

Is there a Delphi equivalent of the C# #if(DEBUG) compiler directive?

Answer 1

These control directives are available:

{$IFDEF}
{$ELSE}
{$ENDIF}
{$IFNDEF} //if *not* defined

and they can be used as shown here:

procedure TfrmMain.Button1Click(Sender: TObject);
begin
  {$IFDEF MY_CONDITIONAL}
  ShowMessage('my conditional IS defined!');
  {$ELSE}
  ShowMessage('my conditional is NOT defined!');
  {$ENDIF}

  {$IFNDEF MY_CONDITIONAL}
  ShowMessage('My conditional is explicitly NOT defined');
  {$ENDIF}
end;