'use strict';
const { Queue } = require('plain-queue');
const queue = new Queue;
// внутри async function
chat.quiz = global_quizzes[quiz_id];
if(!chat.quiz) {
chat.quiz = await queue.addTask(function () {
return global_quizzes[quiz_id] || Chat_Quizzes.findById(quiz_id).exec();
});
global_quizzes[quiz_id] = chat.quiz;
}Asynchronous TCP and UDP sockets
Asynchronous DNS resolution
Asynchronous file and file system operations