pionize

async function printFiles () {
  const files = await getFilePaths();

  await Promise.all(files.map(async (file) => {
    const contents = await fs.readFile(file, 'utf8')
    console.log(contents)
  }));
}

pionize

import fs from 'fs-promise'

async function printFiles () {
  const files = await getFilePaths() // Assume this works fine

  files.forEach(async (file) => {
    const contents = await fs.readFile(file, 'utf8')
    console.log(contents)
  })
}

pionize

//implements Promise
const getAllUsers = () => {
  try {
    getUsers()
      .then(result => {
        // this parse may fail
        const data = JSON.parse(result)
        console.log(data)
      })
      // uncomment this block to handle asynchronous errors

pionize

//implements Promise way
const getUserPromise = (name) => {
  return getUserByName('andrew')
    .then(function (user) {
    if (user.role == 'guest') {
      return user;
    } else {
      return false;
    }
  })

pionize

const getUser = async (name) => {
  const user = await getUserByName(name);
  const account = await getUserAccountById(user.id);
  return account;
}

const myUser = getUser('andrew');

pionize

Promise.resolve(someSynchronousValue).then(/* ... */);

pionize

new Promise(function (resolve, reject) {
  resolve(someSynchronousValue);
}).then(/* ... */);

pionize

getUserByName('andrew').then(function (user) {
  return getUserAccountById(user.id);
}).then(function (userAccount) {
  // userAccount data here
});

pionize

somePromise().then(function () {
  someOtherPromise();
}).then(function () {/* ... */});

pionize

// using Bluebird Promise
const Promise = require('bluebird');

new Promise(function (resolve, reject) {
  fs.readFile('myfile.txt', function (err, file) {
    if (err) {
      return reject(err);
    }
    resolve(file);
  });