seanstrom

var extend = require('./extend')

function composer(obj) {
  obj = obj || {}
  
  return {
    extend: function(extension) {
      var extended = extend(obj, extension)
      return composer(extended)
    },

seanstrom

def greeter_sync
  print(“Hello World”)
  sleep(5000) # sleep for 5 seconds
  print(“Goodbye World”)
end

def greeter_async
  # sleep for 5 seconds, then print Goodbye World
  async sleep(5000) then print(“Goodbye World”)
  print(“Hello World”)

seanstrom

Hello World
# ... 5 seconds or so
Goodbye World

seanstrom

var fs = require('fs')
  , path = 'my_file.txt'
  , file

file = fs.readFile(path)

seanstrom

var fs = require('fs')
  , path = 'my_file.txt'
 
fs.readFile(path, function() {
  console.log('done')
})

seanstrom

var fs = require('fs')
  , path = 'my_file.txt'
 
fs.readFile(path, function(err, data) {
  if(err) {
    console.error(err)
  } else {
    console.log(data)
  }
})

seanstrom

var fs = require('fs')
  , path = 'my_file.txt'
 
function getFile(path, callback) {
  fs.readFile(path, function(err, data) {
    if(err){
      return callback(err)
    }

    var wrapperMessage = {coolStuff: true, data: data}

seanstrom

var fs = require('fs')
  , path = 'my_file.txt'
 
function getFile(path, callback) {
  try {
    fs.readFile(path, function(err, data) {
      if(err) throw err
      var wrapperMessage = {coolStuff: true, data: data}
      callback(null, wrapperMessage)
    })

seanstrom

function findLikesForPostsByUsername(username, callback) {
  findUserByUsername(username, function(err, user) {
    if(err) return callback(err)

    findPostsByUser(user, function(err, posts) {
      if(err) return callback(err)
      
      findLikesByPosts(posts, function(err, likes) {
        if(err) return callback(err)
        

seanstrom

function getTweetsPostsRepos(username, callback) {
  var count = 0
    , results = []

  function somethingFinished(err, result) {
    count += 1
    results.push(result)
    
    if(count === 3) {
      callback(null, results)