original_string: public function append(Node $node)
      {
  
          if (!is_array($this->_children)) {
              $this->_children = [];
          }
  
          $this->_children[] = $node;
          return $this;
      }
code: public function append(Node $node)
      {
  
          if (!is_array($this->_children)) {
              $this->_children = [];
          }
  
          $this->_children[] = $node;
          return $this;
      }
code_tokens: public function append ( Node $ node ) { if ( ! is_array ( $ this -> _children ) ) { $ this -> _children = [ ] ; } $ this -> _children [ ] = $ node ; return $ this ; }
docstring: Append a node to the list
  
  @param \BeeTree\Contracts\Node $node
  @return self
docstring_tokens: Append a node to the list