generators + promises = awesome code flow

write.js

const Promise = reuqire('bluebird')

// mach aus callback style -> promise style
// aber dafür muss man "Async" an die Funktionen drangehängt werden
const fs = Promise.promisifyAll(require('fs'))
module.exports = co(function*(filename, text) {
  return yield fs.readFileSync(filename, text)
})

index.js

const Promise = reuqire('bluebird')
const co = Promise.coroutine

const write = require('./write')
const read = Promisie.promisify(require('./read')) 

co(function*() {
  yield write('blub.txt', 'foobar')
  const content = yield readSync('blub.txt')
  console.log(content)
})()

// ODER OHNE IFEE

const main = co(function*() {
  yield write('blub.txt', 'foobar')
  const content = yield readSync('blub.txt')
 console.log(content)
})
main() // hier wird kein yield oder .then benötigt, da es der entry point ist

read.js

const fs = require('fs')
module.exports = function(filename, cb) {
  fs.readFile(filename, cb)
}