App script: copy data from folder to single spreadsheet - google-apps-script

Question

I am working on a script to copy all the all data from sheets saved in a folder and concatenate them to a single spreadsheet.
The variable combinedData is not returning any data when I run it through the logger outside the while loop. Any ideas why this is happening?
// DATA CONCATINATION
function Data_concat() {
var folder = DriveApp.getFolderById("1Rky5tOyrTMJ15uhTog1ltBMwONap7Rx1");
var filesIterator = folder.getFiles();
var file;
var filetype;
var ssID;
var combinedData = [];
var data;
while(filesIterator.hasNext()){
file = filesIterator.next();
filetype = file.getMimeType();
if(filetype === "application/vnd.google-apps.spreadsheet"){
ssID = file.getId();
data = getDatafromSS(ssID);
combinedData = combinedData.concat(data);
}//end of if
}//end of while
Logger.log(combinedData)
//var ws = SpreadsheetApp.getActiveSpreadsheet().getSheetByName("raw_Data");
//ws.getRange("A2:J").clearContent();
//ws.getRange(2,1,combinedData.length, combinedData[0].length).setValues(combinedData)
}//end of Data_concat
//GET DATA FROM TARGET SHEET
function getDatafromSS(ssID){
var ss = SpreadsheetApp.openById(ssID);
var ws = ss.getSheets()[0];
var data = ws.getRange("A2:G" + ws.getLastRow()).getValues();
return data;
}

Answer 1

Save Data in all Spreadsheets in a folder
On Different Sheets:
function saveDataInAllSheetsInAFolder() {
const tss = SpreadsheetApp.getActive();
const tssnames = tss.getSheets().map(sh => sh.getName()).flat();
const fldr = DriveApp.getFolderById("Folderid");
const files = fldr.getFilesByType(MimeType.GOOGLE_SHEETS);
while(files.hasNext()) {
let file = files.next();
let ss = SpreadsheetApp.openById(file.getId());
ss.getSheets().forEach((sh,i) => {
let vs = sh.getDataRange().getValues();
let nsh = tss.insertSheet(ss.getName() + "-" + sh.getName() + "-" + Utilities.formatDate(new Date(),tss.getSpreadsheetTimeZone(),"yyyyMMdd HH:mm:ss.S"));
nsh.getRange(1,1,vs.length,vs[0].length).setValues(vs)
})
}
}
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On Same Sheet:
function saveDataInAllSheetsInAFolder() {
const tss = SpreadsheetApp.getActive();
const nsh = tss.insertSheet(Utilities.formatDate(new Date(),tss.getSpreadsheetTimeZone(),"yyyyMMdd HH:mm:ss.S"));
nsh.getRange(1,1).setValue("Data Sheet " + Utilities.formatDate(new Date(),tss.getSpreadsheetTimeZone(),"yyyyMMdd HH:mm:ss.S") );
tss.setActiveSheet(nsh);
const tssnames = tss.getSheets().map(sh => sh.getName()).flat();
const fldr = DriveApp.getFolderById("Folderid");
const files = fldr.getFilesByType(MimeType.GOOGLE_SHEETS);
while(files.hasNext()) {
let file = files.next();
let ss = SpreadsheetApp.openById(file.getId());
ss.getSheets().forEach((sh,i) => {
let vs = sh.getDataRange().getValues();
nsh.getRange(nsh.getLastRow() + 1,1,vs.length,vs[0].length).setValues(vs);
})
}
}