Pascal (Lazarus/Delphi)

Append New Item to JSON Array

See more JSON Examples

Demonstrates the notations that can be used in a JSON array index to append to the end of an array. Pascal (Lazarus/Delphi)

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.JsonObject;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  json: TJsonObject;

begin
  //  Starting in Chilkat v9.5.0.77, the following notations are possible to specify that the value
  //  should be appended to the end of the array. (In other words, if the array currenty has N elements, then "-1", "", or "*" 
  //  indicate an index of N+1.

  json := TJsonObject.Create;

  json.UpdateInt('lanes[-1]',0);
  json.UpdateInt('lanes[]',1);
  json.UpdateInt('lanes[*]',2);
  json.UpdateInt('lanes[-1]',3);

  WriteLn(json.Emit());

  //  Output is:  {"lanes":[0,1,2,3]}


  json.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.