Controller members

Confused about inheritance here.

Here is the helpers var from Cake's controller file.
var $helpers = array('Html', 'Form', 'Javascript', 'Ajax');

AppController extends this so I think that the helpers should be
available there.

My controller AjaxtestsController extends Appcontroller and so they
should also be available there

However when I do the following:
$this->set('myvar', $this->javascript->object($arr));
or
$this->set('myvar', $javascript->object($arr));

I get the following error:

Notice (8): Undefined property: AjaxtestsController::$javascript [APP
\controllers\ajaxtests_controller.php, line 26]

Code | Context

$arr = array(
"item 1",
"item 2"
)

//debug($this);
$this->set('myvar', $this->javascript->object($arr));

AjaxtestsController::edit() - APP\controllers
\ajaxtests_controller.php, line 26
Object::dispatchMethod() - CORE\cake\libs\object.php, line 115
Dispatcher::_invoke() - CORE\cake\dispatcher.php, line 245
Dispatcher::dispatch() - CORE\cake\dispatcher.php, line 211
[main] - APP\webroot\index.php, line 88

Fatal error: Call to a member function object() on a non-object in C:
\htdocs\caketest\app\controllers\ajaxtests_controller.php on line 26

CODE POSTED BELOW

<?php

class AjaxtestsController extends AppController
{

var $helpers = array('Javascript');

function index()
{
$this->pageTitle = 'Index Page';
}

function view()
{
$this->pageTitle = 'View Page';
}

function edit()
{
$this->pageTitle = 'Edit Page';

$arr = array('item 1', 'item 2');

//debug($this);
$this->set('myvar', $this->javascript->object($arr));
}

}

?>

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