seanstrom

// Part 2

var username = 'seanghagstrom'

findLikesForPostsByUsername(username, function(err, totalLikes) {
  if(err) {
    console.error(err)
  } else {
    console.log(username + ' total number of likes: ' + totalLikes)
  }

seanstrom

// Part 1

function findLikesForPostsByUsername(username, mainCallback) {
  async.waterfall([
    function(callback) {
      findUserByUserName(username, callback)
    },
    function(user, callback) {
      findPostsByUser(user, callback)
    },

seanstrom

// Part 3

var username = 'seanghagstrom'

getTweetsPostsRepos(username, function(err, tweetsPostsRepos) {
  if(err) {
    console.error(err)
  } else {
    console.log(username + ' has this stuff ' + tweetsPostsRepos)
  }

seanstrom

// Part 2

function getTweetsPostsRepos(username, callback) {
  // counter
  
  getTweets(username, function(err, results) {
    if(err) return callback(err)
    
    somethingFinished(null, results)
  })

seanstrom

// Part 1

function getTweetsPostsRepos(username, callback) {
  var count = 0
    , results = []
 
  function somethingFinished(err, result) {
    count += 1
    results.push(result)
    

seanstrom

// Part 2

var username = 'seanghagstrom'

findLikesForPostsByUsername(username, function(err, totalLikes) {
  if(err) {
    console.error(err)
  } else {
    console.log(username + ' total number of likes: ' + totalLikes)
  }

seanstrom

// Part 1

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) {

seanstrom

// Part 2

getFile(path, function(err, message) {
  if(err) {
    console.error(err)
  } else {
    console.log(message)
  }
})

seanstrom

// Part 1

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}

seanstrom

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