alessioalex

// our own in memory database
var users = {
  'alex': { user: 'alex', age: 27 },
  'john': { user: 'johndoe', age: 34 }
};

// async function
var getUserFromDb = function getUserFromDb(id, callback) {
  var min = 1000;
  var max = 2000;

alessioalex

// our own in memory database
var users = {
  'alex': { user: 'alex', age: 27 },
  'john': { user: 'johndoe', age: 34 }
};

// async function
var getUserFromDb = function getUserFromDb(id, callback) {
  var min = 1000;
  var max = 2000;

alessioalex

// dividing it into chunks
var getSum = function getSumOfEvenNumbers(opts, cb) {
  var sum = opts.sum || 0;
  var i = opts.i || 0;
  var stopAt = opts.stopAt;

  var CHUNK_SIZE = 1000000;
  var nextStop = (stopAt < (i + CHUNK_SIZE)) ? stopAt : (i + CHUNK_SIZE);

  for (; i < nextStop; i++) {

alessioalex

var log = function(i) {
  console.log(i);
}

function tellMeLater() {
  for (var i = 0; i < 10; i++) {
    setTimeout(log.bind(null, i), 100);
  }
}

alessioalex

function tellMeLater() {
  for (var i = 0; i < 10; i++) {
    (function(i) {
      setTimeout(function() {
        console.log(i);
      }, 100);
    }(i));
  }
}

alessioalex

function Person(name, age) {
  this.name = name;
  this.age = age;
}

Person.prototype.getInfoCard = function() {
  return this.name + ', ' + this.age + ' years old';
};

var johnny = new Person('John', '25');

alessioalex

function Person(name, age) {
  this.name = name;
  this.age = age;
}

Person.prototype.getInfoCard = function() {
  return this.name + ', ' + this.age + ' years old';
};

// function Student(name, age, university) {

alessioalex

// example from http://codewinds.com/blog/2013-08-19-nodejs-writable-streams.html
"use strict";

var stream = require('stream');
var util = require('util');
// use Node.js Writable, otherwise load polyfill
var Writable = stream.Writable;

var memStore = { };

alessioalex

// http://codewinds.com/blog/2013-08-20-nodejs-transform-streams.html
"use strict";

var crypto = require('crypto');
var stream = require('stream');
var util = require('util');

var Transform = stream.Transform;

function ShaSum(options) {

alessioalex

function Student(name, age, university) {
  if (!(this instanceof Student)) {
    return new Student(name, age, university);
  }

  // #1 - duplicate code from Person constructor
  //Person.call(this, name, age);
  this.university = university;
}
var junior2 = Student('John', 18, 'MIT');