var delta=new Array(); var del=new Array() function myFunction() { var folder = DriveApp.getFolderById("0B9c7WttLh-m7NWk5WG1PTVRxdDg"); var contents = folder.getFolders(); sx=0; while(contents.hasNext()) { file = contents.next(); sx=sx+1; delta[sx] = file.getId(); } number=sx; sx=0; for(s=1;s<number+1;s++){ var f2 = DriveApp.getFolderById(delta[s]); var c2 = f2.getFiles(); while(c2.hasNext()) { fx = c2.next(); sx=sx+1; del[sx] = fx.getId(); } } Logger.log(sx); }