bakerface/es5-async-await

/**
 * Copyright (c) 2016 Christopher M. Baker
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 */

var async = require('../async');
var await = require('../await');
var Promise = require('when').Promise;

function sleep(ms) {
  return new Promise(function(resolve) {
    setTimeout(resolve, ms);
  });
}

function getMessageById(id) {
  if (id) return Promise.resolve('and you can await values');
  return Promise.reject('using try/catch for errors');
}

var example = async(function(ms) {
  console.log('you can pass async function arguments');
  await(sleep(ms));

  var message = await(getMessageById(1234));
  console.log(message);

  try {
    await(getMessageById());
  }
  catch (e) {
    console.log(e);
  }

  return 'and promises are returned';
});

example(1000)
  .then(console.log)
  .catch(console.error);