devarajchidambaram

Effective Engineer - Notes

• By Edmond Lau
• Highly Recommended 👍
• http://www.theeffectiveengineer.com/

What's an Effective Engineer?

• They are the people who get things done. Effective Engineers produce results.

Adopt the Right Mindsets

devarajchidambaram

const fs = require('fs')

fs.open('./index.js', 'r', (err, fd) => {
    //Access fd here
    
    if(err) return "error while open FD";
    
    fs.readFile(fd, function(err, msg) {
            if(err) return "error while read file";
        console.log('msg===', msg.toString())

devarajchidambaram

const cluster = require('cluster');
const http = require('http');
const numCPUs = require('os').cpus().length;

if (cluster.isMaster) {
  console.log(`Master ${process.pid} is running`);
   var worker_id = '';
  // Fork workers.
  for (let i = 0; i < numCPUs; i++) {
    worker_id = '900'+i;

devarajchidambaram

//https://www.npmjs.com/package/recluster
var recluster = require('recluster'),
    path = require('path');
 
var cluster = recluster(path.join(__dirname, 'server.js'),{workers : 2});

cluster.run();
 
process.on('SIGUSR2', function() {
    console.log('Got SIGUSR2, reloading cluster...');

devarajchidambaram

//https://www.npmjs.com/package/recluster
var recluster = require('recluster'),
    path = require('path');
 
var cluster = recluster(path.join(__dirname, 'server.js'),{workers : 2});

cluster.run();
 
process.on('SIGUSR2', function() {
    console.log('Got SIGUSR2, reloading cluster...');

devarajchidambaram

var http = require('http');
var cluster = require('cluster');
// The master's job to spawn workers initially and when they die
if (cluster.isMaster) {
    // Get the number of processor cores
    var cpuCount = require('os').cpus().length;

    // Create a worker for each CPU
    for (var i = 0; i < cpuCount; i += 1) {
        cluster.fork();

devarajchidambaram

let validator = {
    set: function name(Obj, param, value) {
        if(param === 'age'){
            if(! Number.isInteger(value)) throw new Error("age is not an number type")

            if( !(value > 18 && value < 80)){
               throw Error("age range error, age must between 18 to 80 ");
            } 
        }

devarajchidambaram

var svgWidth = 800;
var svgHeight = 300;

var margin = {top: 30, right: 40, bottom: 50, left: 60};

var width = svgWidth - margin.left - margin.right;
var height = svgHeight - margin.top - margin.bottom;

var originalCircle = {"cx" : -150 ,
                      "cy" : -15 ,

devarajchidambaram

-- phpMyAdmin SQL Dump
-- version 4.0.9
-- http://www.phpmyadmin.net
--
-- Inang: localhost
-- Waktu pembuatan: 02 Mei 2014 pada 12.05
-- Versi Server: 5.5.34
--  mysql -u username -p database_name < file.sql

--create table customer (

devarajchidambaram

module.exports.eventLoopblocked  = function(func, opts){
   
    var option = opts | {};
    var threshold = opts.threshold | 10;
    var interval = opts.threshold | 100;
    var startTime= process.hrtime();
    var delta;

    var timer = setInterval(function(){