Create list of all sheet names in Google Apps Scripts

Question

My goal

I have two spreadsheets, SpreadSheetA and SpreadSheetB.

I am trying to get a list of the names of all the sheets in SpreadSheetA and add it to the

Answer 1

Try the below...

function getSheetNamesAndAddToOtherSheet() {
  var spreadSheetAURL = "https://docs.google.com/spreadsheets/d/UNIQUE-ID-HERE/edit"; 
  var spreadSheetsInA = SpreadsheetApp.openByUrl(spreadSheetAURL).getSheets();
  var sheet = SpreadsheetApp.getActiveSpreadsheet().getActiveSheet();
  for (var i = 0; i < spreadSheetsInA.length; i++) {
    sheet.appendRow([spreadSheetsInA[i].getName()])
  }
}

Answer 2

The error message hints at what's wrong: the setValues method expects "Object[][]" that is a double array of things. In Google Sheets, all ranges of data are represented as double arrays, such as [[1, 2], [3, 4]]. If there is one row, it's still a double array: [[1, 2]]. If it's one column: [[1], [3]].

So you need this extra array dimension, essentially wrapping every sheet name in square brackets. This is done below, where I also used map method to process the array of sheets: this is cleaner and likely more efficient than using push in a for loop.

function getSheetNamesAndAddToOtherSheet() {
  var spreadSheetAURL = "https://docs.google.com/spreadsheets/d/UNIQUE-ID-HERE/edit"; 
  var sheetNameArray = [];

  var spreadSheetsInA = SpreadsheetApp.openByUrl(spreadSheetAURL).getSheets();

  sheetNameArray = spreadSheetsInA.map(function(sheet) {
    return [sheet.getName()];
  });

  var sheet = SpreadsheetApp.getActiveSpreadsheet().getActiveSheet();
  var range = sheet.getRange(1, 1, sheetNameArray.length, 1);
  range.setValues(sheetNameArray);
}