[Google Apps Script] Randomize range

Code.gs

function randomizeImages() {
  spreadsheetId = "1u3XwgQ5ga36KX9j2yKkSuyUlUJo7lTdAsmj2JJ4Yq08";
  var ss = SpreadsheetApp.openById(spreadsheetId);
  SpreadsheetApp.setActiveSpreadsheet(ss);
  
  var uploadSheetName = "HIT Upload";
  SpreadsheetApp.setActiveSheet(ss.getSheetByName(uploadSheetName));
  var sheet = ss.getActiveSheet();
  
  var sheetData = sheet.getDataRange().getValues();
  for (var col_index = 0; col_index < 126; col_index++) {
    var range = sheet.getRange(2, col_index + 1, 42);
    var array = range.getValues();
    shuffleArray(array);
    range.setValues(array);
  }
}

/**
 * Randomize array element order in-place.
 * Using Durstenfeld shuffle algorithm.
 */
function shuffleArray(array) {
    for (var i = array.length - 1; i > 0; i--) {
        var j = Math.floor(Math.random() * (i + 1));
        var temp = array[i];
        array[i] = array[j];
        array[j] = temp;
    }
}