33     protected $helpers = [];  variable in Handlebars\\Helpers
59      * @param array      $helpers  array of name=>$value helpers
63     public function __construct($helpers = null)  argument
70         if ($helpers != null) {
71             if (!is_array($helpers) && !$helpers instanceof Traversable) {
76             foreach ($helpers as $name => $helper) {
96         $this->helpers[$name] = $helper;
108         return array_key_exists($name, $this->helpers);
124         return $this->helpers[$name];
162         unset($this->helpers[$name]);
177         unset($this->helpers[$name]);
189         $this->helpers = [];
199         return empty($this->helpers);