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// As stated before "readyState" is good. "ping" is also good admin utility for doing so as well. 
// It will return { ok: 1 } if it can accept commands.

const mongoose = require('mongoose');

// Create the database connection.
const connection = await mongoose.createConnection(
    CONNECT_URI,
    CONNECT_OPTS
);

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{
  "Horizontal Spacing" : 1,
  "Tags" : [

  ],
  "Ansi 12 Color" : {
    "Red Component" : 0.50197118520736694,
    "Color Space" : "sRGB",
    "Blue Component" : 0.9097973108291626,
    "Alpha Component" : 1,

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" Specify Vim-Plug installation folder 
call plug#begin('~/.vim/plugged')

Plug 'tpope/vim-sensible'

" Install the Nightfly color scheme plugin
Plug 'zacanger/angr.vim'
Plug 'jacoborus/tender.vim'
Plug 'vim-airline/vim-airline'
Plug 'vim-airline/vim-airline-themes'

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/*
 * Provides a powerful tool for implementing custom iterators and 
 * simplifying asynchronous workflows. Generators make it easier to 
 * handle complex iteration logic and asynchronous processes, leading 
 * to more readable and maintainable code. They can also be used for 
 * tasks like managing asynchronous operations in a more 
 * straightforward, linear fashion.
 */
function* objectEntries(obj) {
    for (let key of Object.keys(obj)) {

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/* The Proxy object allows you to create a proxy for another object, 
 * enabling you to intercept and redefine fundamental operations such 
 * as property lookup, assignment, enumeration, function invocation, 
 * etc. This provides a powerful way to add custom behavior to objects.
 */
const user = {
    name: 'John',
    age: 30
};

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/* This code utilizes the “cluster” module to create multiple worker processes, 
 * each handling incoming requests. This approach allows you to scale your 
 * application horizontally to handle increased traffic. Note that they all use
 * the same port.
 */
const cluster = require('cluster');

if (cluster.isMaster) {
    // Master process forks worker processes
    for (let i = 0; i < numCPUs; i++) {

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/* This code utilizes “cacheable-request” to cache the response from the 
 * specified URL for 60 seconds. Subsequent requests within that timeframe 
 * will retrieve the data from the cache, reducing API calls and improving 
 * responsiveness.
 */
const cacheableRequest = require('cacheable-request');

const cachedRequest = cacheableRequest(
    requestFn,
    { ttl: 60000 } // Cache for 60 seconds

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/* This code creates a worker thread from the “long_calculation.js” file. The main 
 * thread sends data to the worker, which performs the calculation and returns the 
 * result via the “ message ” event. This approach keeps your main thread responsive 
 * while intensive tasks run in the background.
 */
const { Worker } = require('worker_threads');

const worker = new Worker('./long_calculation.js');

worker.on('message', (result) => {

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/* The streamlined operator (“ ?. ”) acts as a nullish coalescing operator. It checks if 
 * the preceding value is “ null ”or “ undefined ” before attempting to access the next 
 * property. This simplifies conditional checks and streamlines your code, making it more 
 * readable and less error-prone.
 */
async function getUser(userId) {
  const user = await db.getUser(userId);
  // Traditional approach (prone to errors with undefined values)
  if (user && user.profile && user.profile.avatarUrl) {
    return user.profile.avatarUrl;

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class SampleService {
    constructor(connection) {
        this.model = connection.models['sample'];
        this.connection = connection;
    }
    
    async findById(id) {
        return this.model.findById(id);
    }
}