es6 promises and generators

es6 promises and generators

var a = new Promise(function(reject, resolve) {
  if(err) return reject(err);
  .......
  resolve(value);
});

var b = new Promise(function(reject, resolve) {
  if(err) return reject(err);
  .......
  resolve(value);
});

results = yield Promise.all([a,b])

a.then(function(value) {

}).catch(function(err) {

});

var co = require('co');

co(function*() {
  var db = yield MongoClient.connect('....');
  var value = yield db.collection('a').findOne()
}).catch(function(e) {

});

User.prototype.getUser = function() {
  var self = this;

  return new Promise(function(resolve, reject) {
    co(function*() {
      var user = yield self.db.collection('users').findOne();
      resolve(user);    
    }).catch(reject);
  })
}