Samjin

"use strict";
//  https://expressjs.com/en/4x/api.html#res
const express = require("express");
const app = express();
const port = process.env.port || 3000;
app.set("view engine", "pug");
app.set("views", process.cwd() + "/views");

app.get("/", (req, res) => {
  //handle route: get requests for "/"

Samjin

const dns = require('dns');
const http = require('http');
const https = require('https');
const tls = require('tls');
const net = require('net');
const request = require('request');

const httpAgent = new http.Agent();
const httpsAgent = new https.Agent();

Samjin

const http = require("http");
const net = require("net");

const server = http.createServer((req, res) => {
  req.resume();
  res.end("hello");
});

server.keepAliveTimeout = 6 * 1000;
server.headersTimeout = 4 * 1000;

Samjin

When you need to set value to "UV_THREADPOOL_SIZE"?

• Libuv has a default thread pool size of 4, and uses a queue to manage access to the thread pool - the upshot is that if you have 5 long-running DB queries all going at the same time, one of them (and any other asynchronous action that relies on the thread pool) will be waiting for those queries to finish before they even get started.

• Note, however, that tuning UV_THREADPOOL_SIZE may make more sense for a standalone application like a CLI written in Node.js. If you are standing up a bunch of Node.js processes using the cluster module then I would be surprised if tuning UV_THREADPOOL_SIZE was particularly beneficial for you. But if your application resembles the web tooling benchmarks then tuning UV_THREADPOOL_SIZE may help with performance.

Samjin

Multiple SSH Keys settings for different github account

create different public key

create different ssh key according the article Mac Set-Up Git

$ ssh-keygen -t rsa -C "your_email@youremail.com"

Samjin

mysql -u root -p epg < epg.sql

Samjin

http://webdesign.tutsplus.com/tutorials/comprehensive-guide-when-to-use-em-vs-rem--cms-23984

rem and em units are computed into pixel values by the browser, based on font sizes in your design.
em units are based on the font size of the element they’re used on.
rem units are based on the font size of the html element.
em units can be influenced by font size inheritance from any parent element
rem units can be influenced by font size inheritance from browser font settings.

Use em units for sizing that should scale depending on the font size of an element other than the root.
Use rem units for sizing that doesn’t need em units, and that should scale depending on browser font size settings.

Samjin

var module = (function() {

    var _private = {
        i:5,
        get : function() {
            console.log( "current value:" + this.i);
        },
        set : function( val ) {
            this.i = val;
        },

Samjin

class Car {
  constructor(options) {
    this.doors = options.doors || 4;
    this.state = options.state || "brand new";
    this.color = options.color || "silver";
  }
}

class Truck {
  constructor(options) {

Samjin

var throttle = (function () {
  return function (fn, delay) {
    delay || (delay = 100);
    var last = +new Date;
    return function () {
      var now = +new Date;
      if (now - last > delay) {
        fn.apply(this, arguments);
        last = now;
      }