unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  end;

where
  Form1: TForm1;

implementation

{$R *.dfm}

uses SuperObject;

//Types of
procedure TForm1.Button1Click(Sender: TObject);
  function GetJsonType(I: ISuperObject): string;
  begin
    case I.DataType of
      stNull:    Result := 'stNull';
      stBoolean: Result := 'stBoolean';
      stDouble:  Result := 'stDouble';
      stInt:     Result := 'stInt';
      stObject:  Result := 'stObject';
      stArray:   Result := 'stArray';
      stString:  Result := 'stString';
      stMethod:  Result := 'stMethod';
    end;
  end;
where
  jo: ISuperObject;
do 
  you start: = SO ('{A:1, B:2}');
  ShowMessage(GetJsonType(jo)); {stObject}
  jo: = SO;
  ShowMessage(GetJsonType(jo)); {stObject}

  jo: = SO ('abc');
  ShowMessage(GetJsonType(jo)); {stString}

  jo: = SO (123);
  ShowMessage(GetJsonType(jo)); {stInt}
  jo: = SO ('123');
  ShowMessage(GetJsonType(jo)); {stInt}

  jo: = SO (3.14);
  ShowMessage(GetJsonType(jo)); {stDouble}
  jo: = SO ('3.14');
  ShowMessage(GetJsonType(jo)); {stDouble}

  jo: = SO (False);
  ShowMessage(GetJsonType(jo)); {stBoolean}

  jo: = SO ('[1,2,3,a,b,c]');
  ShowMessage(GetJsonType(jo)); {stArray}

  jo: = TSuperObject.Create (stMethod);
  ShowMessage(GetJsonType(jo)); {stMethod}

  jo: = SO ('null');
  ShowMessage(GetJsonType(jo)); {stNull}
end;

// Judgment
procedure TForm1.Button2Click(Sender: TObject);
where
  jo: ISuperObject;
do 
  you start: = SO ('[]');

  if jo.DataType = stArray then ShowMessage('stArray');

  if ObjectIsType(jo, stArray) then ShowMessage('stArray');
end;

end.