Google apps script - iterate folder and subfolder

Question

I want to iterate through the tree structure of the folder in Google Drive using google apps script. The code below is listing some of the folders but not all. Can you advic

Answer 1

This should do the trick:

function start() {
 folder = DriveApp.getFolderById("0B_5HSTQXtXmsOHBzcnc2dTlkRFU") 
 listFolders(folder)
}

function listFolders(folder) {
  //starting point, we come here from start() or from the bottom of this function



  //check the name
  var name = folder.getName();

  if (name.match("TITL")) { 
     folder.addEditor("somePerson@gmail.com"); 
  }

  //now see if this folder has subfolders
  var subfolders = folder.getFolders();

  //if it has, we call this function again
  while (subfolders.hasNext()) {    
    listFolders(subfolders.next());
  }

}