Neos\Eel\FlowQuery\Operations\FirstOperation::evaluate PHP Method

    public function evaluate(FlowQuery $flowQuery, array $arguments)
    {
        $context = $flowQuery->getContext();
        if (isset($context[0])) {
            $flowQuery->setContext([$context[0]]);
        } else {
            $flowQuery->setContext([]);
        }
    }