var n=new Array(); var id=new Array(); var idx=new Array(); function myFunction() { var folder = DriveApp.getFolderById("0B9c7WttLh-m7OEZaeWdWMTdJTzg"); var con = folder.getFiles(); sx=0; while(con.hasNext()) { file = con.next(); n[sx]= file.getName(); id[sx]= file.getId(); sx=sx+1; } number=sx; var ar = n.sort(); for(s=0;s<number;s++){ idx[s]=""; for(sx=0;sx<number;sx++){ if(ar[s]==n[sx])idx[s]=id[sx]; } Logger.log(idx[s]); } }