public function checked($checked = [])
    {
        if ($checked instanceof Arrayable) {
            $checked = $checked->toArray();
        }

        $this->checked = array_merge($this->checked, $checked);

        return $this;
    }
public function checked($checked = [])
    {
        if ($checked instanceof Arrayable) {
            $checked = $checked->toArray();
        }

        $this->checked = array_merge($this->checked, $checked);

        return $this;
    }
public function checked ( $ checked = [ ] ) { if ( $ checked instanceof Arrayable ) { $ checked = $ checked -> toArray ( ) ; } $ this -> checked = array_merge ( $ this -> checked , $ checked ) ; return $ this ; }
Set the field option checked.

@param array $checked

@return $this
Set the field option checked .