public function newTasks(Request $request)
    {
        // callback for return all tasks
        $returnResponse = function($tasks) {
            $response = [];
            foreach ($tasks as $task) {
                $response[] = [
                    'id' => $task->id,
                    'package_name' => $task->package_name,
                    'title' => $task->title,
                    'status' => $task->status,
                    'image_url' => $task->image_url,
                    'award' => $task->award,
                    'daily_award' => $task->daily_arard,
                    'type' => $task->type,
                    'amount' => $task->amount,
                    'keywords' => $task->keywords,
                ];
            }

            return $response;
        };

        // get viewed tasks
        $user_tasks = $this->user->tasks()->whereIsChecked(1)->get();

        // if tasks array is not empty
        if ($user_tasks->isNotEmpty()) {

            // get theirs ids
            $taskIds = $user_tasks->pluck('id');
            // get only not checked tasks
            $notCheckedTasks = Task::whereNotIn('id', $taskIds)->limit($request->get('start'))->offset($request->get('offset'))->get();

            return new JsonResponse(
                $returnResponse($notCheckedTasks),
                200);
        }

        // get only completed tasks
        $user_tasks = $this->user->tasks()->whereDone(1)->get();
        // get theirs ids
        $taskIds = $user_tasks->pluck('id');
        // get only not checked tasks
        $notCheckedTasks = Task::whereNotIn('id', $taskIds)->limit($request->get('start'))->offset($request->get('offset'))->get();

        return new JsonResponse(
            $returnResponse($notCheckedTasks),
            200);
    }