Rediscovering JavaScript

Chapter 10

Here are the solutions to the ​Exercises​, for the Chapter 10, ​Keeping Your Promises​ chapter.

Exercise 1

No. Promise.race() will complete with the state of the first promise to complete. If the first resolves, then race() will resolve. If the first rejects, so will race().

Exercise 2

No. If any of the candidate promise rejects, then all() will reject. However, if no candidate promise has rejected, then all() will resolve when all candidate promises resolve.

Exercise 3

/*
npm install fs-extra
*/

'use strict';

const fs = require('fs-extra');

fs.readFile(__filename)
  .then(contents => console.log(contents.toString()))
  .catch(err => console.log(err.message));

Exercise 4

'use strict';

const fs = require( ...