NavigationController with added pop() and close_all() methods

NavigationController_Ex1.js

/**
 * https://github.com/appcelerator-developer-relations/Forging-Titanium/tree/master/ep-002
 * written by Kevin Whinnery, Appcelerator
 */

function dump(windowStack) {
  var titles = [];
  for (var i=0; i < windowStack.length; i++) {
    var win = windowStack[i]
    titles.push(win.title);
  }
  return JSON.stringify(titles); 
}


exports.NavigationController = function() {
  this.windowStack = [];

  var that = this;
  Ti.App.addEventListener('app:pop_window', function(e) {
    that.pop();
  });
};

exports.NavigationController.prototype.pop = function() {
  Ti.API.info("before close: "+dump(this.windowStack));
  var winToClose = this.windowStack && this.windowStack.length > 1 ? this.windowStack[this.windowStack.length - 1] : undefined;
  if (winToClose) {
    (this.navGroup) ? this.navGroup.close(winToClose) : winToClose.close();
  }
};

exports.NavigationController.prototype.open = function(/*Ti.UI.Window*/windowToOpen) {
  //add the window to the stack of windows managed by the controller
  this.windowStack.push(windowToOpen);

  //grab a copy of the current nav controller for use in the callback
  var that = this;
  windowToOpen.addEventListener('close', function(e) {
    var popped = that.windowStack.pop();
    popped = null;
    Ti.API.info("after event: "+dump(that.windowStack));
  });
  
  //hack - setting this property ensures the window is "heavyweight" (associated with an Android activity)
  windowToOpen.navBarHidden = windowToOpen.navBarHidden || false;

  //This is the first window
  if(this.windowStack.length === 1) {
    if(Ti.Platform.osname === 'android') {
      windowToOpen.exitOnClose = true;
      windowToOpen.open();
    } else {
      this.navGroup = Ti.UI.iPhone.createNavigationGroup({
        window : windowToOpen
      });
      var containerWindow = Ti.UI.createWindow();
      containerWindow.add(this.navGroup);
      containerWindow.open();
    }
  }
  //All subsequent windows
  else {
    if(Ti.Platform.osname === 'android') {
      windowToOpen.open();
    } else {
      this.navGroup.open(windowToOpen);
    }
  }
};

//go back to the initial window of the NavigationController
exports.NavigationController.prototype.home = function() {
  while(this.windowStack.length > 1) {
    var winToClose = this.windowStack.pop();
    winToClose.popped = true; // prevents close() event listener from removing from the stack
    (this.navGroup) ? this.navGroup.close(winToClose, { animated: false }) : winToClose.close({ animated: false });
  }
};


// remove all windows from this controller
exports.NavigationController.prototype.close_all = function() {
  while(this.windowStack.length > 0) {
    var winToClose = this.windowStack.pop();
    winToClose.popped = true; // prevents close() event listener from removing from the stack
    (this.navGroup) ? this.navGroup.close(winToClose, { animated: false }) : winToClose.close({ animated: false });
  }
};