FluentDOM\Query::map PHP Method

    public function map(callable $function)
    {
        $result = array();
        foreach ($this->_nodes as $index => $node) {
            $mapped = $function($node, $index);
            if ($mapped === NULL) {
                continue;
            } elseif ($mapped instanceof \Traversable || is_array($mapped)) {
                foreach ($mapped as $element) {
                    if ($element !== NULL) {
                        $result[] = $element;
                    }
                }
            } else {
                $result[] = $mapped;
            }
        }
        return $result;
    }