Sort Google Sheets worksheets by name. Useful when you have more than 8 worksheets inside a spreadsheet.

code.gs

/* INSTRUCTION
- On your spreadsheet, go to Tools > Script Editor to open the Script Editor in a new tab.
- Paste the code below, starting from the double slash to the end into any file that ends with .gs extension.
- Save the .gs file and reload your spreadsheet to see the new menu.
*/
// This creates a menu which contains menu item that when clicked will trigger the function to sort worksheets by name.
function onOpen(e) {
  SpreadsheetApp.getUi()
  .createMenu('Utils')
  .addItem('Sort Worksheets By Name', 'sortWorksheetsByName')
  .addToUi();
}

function sortWorksheetsByName() {
  var ss = SpreadsheetApp.getActiveSpreadsheet();
  var sheetArr = [];
  var sheets = ss.getSheets();
  for (var i = 0; i < sheets.length; i++) {
    sheetArr.push(sheets[i].getName());
  };
  sheetArr.sort();
  Logger.log(sheetArr);
  for (var j = 0; j < sheets.length; j++) {
    ss.setActiveSheet(ss.getSheetByName(sheetArr[j]));
    ss.moveActiveSheet(j + 1);
  }
}