generator-control-flow.js

'use strict';

var fs = require('fs')

var read = function(name) {
  return function(cb) {
    fs.readFile(name, {encoding: 'utf-8'}, cb)
  }
}

function wrap(gen) {
  let g = gen()

  iter(g.next())

  function iter(n) {
    if (!n.done) {
      let val = n.value
      if (typeof val === 'function') {
        val(function(err, data) {
          iter(g.next(data))
        })
      } else {
        g.next(val)
      }
    } else {
      g.next(n.value)
    }
  }
}

wrap(function*() {
  console.log(yield read('./GLOSSARY.md'))
  console.log(123)
})