example of async await for reading multiple files

async-await.js

let Promise = require('bluebird');
let fs = Promise.promisifyAll(require('fs')); // adds Async() versions that return promises
let path = require('path');
let _ = require('lodash');

/** Returns the number of files in the given directory. */
let countFiles = async function(dir) {
  let files = await fs.readdirAsync(dir);
  console.log(files);
  let paths = _.map(files, (file) => path.join(dir, file));
  console.log(paths);
  let stats = _.map(paths, (path) => {
      console.log('promise for async: ' + path)
      return fs.statAsync(path).then(res => {
        console.log('got result for ' + path);
        return res.isFile()
      })
    }); // parallel!

  let results = await Promise.all(stats);
  // let results = await* stats --> this is the same as doing Promise.all but got a warning from babel that it could be deprecated?

  return _.filter(results, (res) => res).length;
}

// Give it a spin
countFiles(__dirname)
  .then (function (num) { console.log('There are ' + num + ' files in ' + __dirname); })
  .catch(function (err) { console.log('Something went wrong: ' + err); });

result.md

babel-node async-await.js

[ 'node_modules', 'package.json', 'test-async-await.js' ]

[ '/Users/devin/Repos/js-scratch/async-await/node_modules',

'/Users/devin/Repos/js-scratch/async-await/package.json',

'/Users/devin/Repos/js-scratch/async-await/test-async-await.js' ]

promise for async: /Users/devin/Repos/js-scratch/async-await/node_modules

promise for async: /Users/devin/Repos/js-scratch/async-await/package.json

promise for async: /Users/devin/Repos/js-scratch/async-await/test-async-await.js

got result for /Users/devin/Repos/js-scratch/async-await/node_modules

got result for /Users/devin/Repos/js-scratch/async-await/package.json

got result for /Users/devin/Repos/js-scratch/async-await/test-async-await.js

There are 2 files in /Users/devin/Repos/js-scratch/async-await