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let fs = {
  readFile: function(filename, cb){
    setTimeout(()=>{
      cb('hello')
    }, 100)
  }
}
let readFilePro = function(filename){
  return new Promise(function(resolve, reject) {
    fs.readFile(filename, (data, err) => {

yesvods

//ES6 Class inherit example
class Person{
  sayName(){
    console.log(this.name);
  }
}
class Classmate extends Person {
  constructor(name){
    super()
    this.name = name;

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//mock a fs Object
let fs = {
  readFile: function(filename, cb){
    let randomTime = 100+Math.random()*1000>>0;
    
    setTimeout(()=>{
      cb(`hello ${filename}`)
    }, randomTime)
  }
}

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What is your folder-structure preference for a large-scale Node.js project?

0: Starting from Rails

This is the reference point. All the other options are based off this.

|-- app
|   |-- controllers
|   |   |-- admin

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const obj1  = {name:"xiaoming", age: 23}
const obj2  = {age: 33}
const obj3 = {...obj1, ...obj2}
//obj3 ==> {"name":"xiaoming","age":33}

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const arr1 = [1,2,3]
const arr2 = [4,5,6]
const arr3 = [...arr1, ...arr2] //arr3 ==> [1,2,3,4,5,6]

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function server(req, res){
  let next = () => {
    //deal with ending job
  }
  middlewares.reduceRight((next, middleware) => {
    return () => {
      middleware(req, res, next)
    }
  }, next)();
}

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if (localStorage && !localStorage.getItem('size')) {
    var i = 0;
    try {
        // Test up to 10 MB
        for (i = 250; i <= 10000; i += 250) {
            localStorage.setItem('test', new Array((i * 1024) + 1).join('a'));
        }
    } catch (e) {
        localStorage.removeItem('test');
        localStorage.setItem('size', i - 250);            

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(function(console){

console.save = function(data, filename){

    if(!data) {
        console.error('Console.save: No data')
        return;
    }

    if(!filename) filename = 'console.json'

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function template(html, data){
  //process html template
  html = html.replace(/>/g, ">")
            .replace(/&lt;/g, "<")
            .replace(/[\r\t\n]\s+/g, '')
            .trim();
  
  var re = /<%([^>]+)?%>/g, 
      reExp = /(^( )?(if|for|else|switch|case|break|{|}|var|let|const))(.*)?/g, 
      code = 'var r=[];\n',