Creating Dictionary in JavaScript

I am not used with dictionaries in javascript.

I ve tried something like this:

function testt()
{
  var arrList = getActiveXObject("Scripting.Dictionary");
  
  for (let i = 1; i <= wndConspanAnalysisGrid.wRowCount; i++)
  {
    var arrListColumns = getActiveXObject("Scripting.Dictionary");

    //Principal keys
    for (let j = 1; j <= wndConspanAnalysisGrid.wColumnCount; j++)
    {
      arrListColumns.Add(GetCellText(0, j), GetCellText(i, j));
    }

    var arrayTest = (new VBArray(arrListColumns.Items())).toArray();
    Log.Message("Count " + arrayTest.length);

    for (let k = 0 ; k < arrayTest.length; k++)
      Log.Message(arrayTest[i]);

    arrList.Add(GetCellText(i, 0), arrListColumns);
  }

  return arrList;
}

My new question is how can i print to log.message the whole dictionary to see if its working properly or a function to get the specific element from this dictionary?