Google Apps Scriptでファイル名、フォルダ名からファイルへアクセスしたい ref: http://qiita.com/tanaike/items/94c263d3906ee23ad522

sample.s

function F_number(file_name, folder_name) {
  var Array_files = [];
  var Array_folders = [];

  var fileIT = DriveApp.getFilesByName(file_name);
  while (fileIT.hasNext()) {
    Array_files.push(fileIT.next().getId());
  };

  var folderIT = DriveApp.getFoldersByName(folder_name);
  while (folderIT.hasNext()) {
    Array_folders.push(folderIT.next().getId());
  };
  return [Array_files.length, Array_folders.length];
}