Learning co

co-test.js

var co = require('co');

co(function* () {
  var result = 0;
  result = yield Promise.resolve(1);
  console.log(result); // 1
  result = yield Promise.resolve(result + 1);
  console.log(result); // 2
  return 3;
}).then(function(res) {
  console.log(res); // 3
});