rafaeljesus

Backend Development

• node.js
  • Installation paths: use one of these techniques to install node and npm without having to sudo.
  • Node.js HOWTO: Install Node+NPM as user (not root) under Unix OSes
  • Felix's Node.js Guide
  • Creating a REST API using Node.js, Express, and MongoDB
  • Node Cellar Sample Application with Backbone.js, Twitter Bootstrap, Node.js, Express, and MongoDB
  • JavaScript Event Loop
• Node.js for PHP programmers

rafaeljesus

var Promise = require('bluebird');

var funcs = Promise.resolve([500, 100, 400, 200].map((n) => makeWait(n)));

funcs
  .each(iterator)       // logs: 500, 100, 400, 200
  .then(console.log)    // logs: [ [Function], [Function], [Function], [Function] ]

funcs
  .mapSeries(iterator)  // logs: 500, 100, 400, 200

rafaeljesus

var Promise = require('bluebird');

var promiseWhile = function(condition, action) {
    var resolver = Promise.defer();

    var loop = function() {
        if (!condition()) return resolver.resolve();
        return Promise.cast(action())
            .then(loop)
            .catch(resolver.reject);

rafaeljesus

// Make sure you added pm2 as a dependency in your package.json
// Then in your Procfile, do a simple `node bootstrap.js`

var pm2 = require('pm2');
 
var MACHINE_NAME = 'hk1';
var PRIVATE_KEY  = 'z1ormi9vomgq66';
var PUBLIC_KEY   = 'oa0m7nuhdfibi16';

var instances = process.env.WEB_CONCURRENCY || -1; // Set by Heroku or -1 to scale to max cpu core -1

rafaeljesus

"use strict";

const GeneratorFunction = function*(){}.constructor;
const GeneratorFunctionPrototype = GeneratorFunction.prototype;
const GeneratorPrototype = GeneratorFunctionPrototype.prototype;

const slice = Array.prototype.slice;
const concat = Array.prototype.concat;
const toString = Object.prototype.toString;

rafaeljesus

#Subject
#Find the sum of the digits of all the numbers from 1 to N (both ends included).
#For N = 10 the sum is 1+2+3+4+5+6+7+8+9+(1+0) = 46
#For N = 11 the sum is 1+2+3+4+5+6+7+8+9+(1+0)+(1+1) = 48
#For N = 12 the sum is 1+2+3+4+5+6+7+8+9+(1+0)+(1+1) +(1+2)= 51
#Supported Ruby version is 1.9.3

#Tests
it 'should' do
   Test.assert_equals(solution(10), 46)

rafaeljesus

{
  "env": {
    "browser": true,
    "node": true,
    "es6": true
  },

  "plugins": ["react"],

  "ecmaFeatures": {

rafaeljesus

Overview

We run multiple server processes in two data centers. Each process listens on two ports, one for HTTP and one for HTTPS. HTTPS is terminated by Apache prior to reaching node.js. HTTP goes directly from the client to node.js (through a master load balancer). We do not use clusters. We slice our physical servers into thin virtual machines running SmartOS, each with about 3GB of memory designed for a single node.js process.

Our node.js servers are hapi.js servers using the composer functionality and plugins architecture. We have three sets of plugins loaded: mobile web front end experience (single page app), legacy API reverse proxy, and monitoring.

We also serve original node.js services off another server zone which runs closed source plugins using hapi.

Analytics

rafaeljesus

// This script will boot app.js with the number of workers
// specified in WORKER_COUNT.
//
// The master will respond to SIGHUP, which will trigger
// restarting all the workers and reloading the app.

var cluster = require('cluster');
var workerCount = process.env.WORKER_COUNT || 2;

// Defines what each worker needs to run

rafaeljesus

// Promise.all is good for executing many promises at once
Promise.all([
  promise1,
  promise2
]);

// Promise.resolve is good for wrapping synchronous code
Promise.resolve().then(function () {
  if (somethingIsNotRight()) {
    throw new Error("I will be rejected asynchronously!");