block1.js

/*
* Promises
* Makes dealing with callbacks a lot easier
* https://developers.google.com/web/fundamentals/primers/promises
*/
 
const promisedFsRead = () => new Promise((resolve, reject) => {
  fs.readFile('/projects', (err, data) => {
    if (err) reject(err) // rejects the error, passed in argument of catch
    if (data) resolve(data) // fulfills the promise, passed in argument of then
    reject("No data") // if data or error is null, then reject with "No Data"
  });
})

promisedFsRead
  .then(data => console.log(data))
  .catch(err => console.error(err))