Asynchronous tasks and callbacks from Lynda Learning Node.js

async_example.js

// this is a sync-demo
fs = require('fs')

data = fs.readdirSync('c:/')

console.log(data)
console.log('this is the data')

// this is a async-demo
fs = require('fs')

function phone(err,data) {
  console.log('data:', data)
}

fs.readdir('c:/',phone)

console.log("this is the data")