freeCodeCamp/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/create-a-javascript-promise.md

id, title, challengeType, forumTopicId

id	title	challengeType	forumTopicId
5cdafbb0291309899753167f	Create a JavaScript Promise	1	301197

Description

A promise in JavaScript is exactly what it sounds like - you use it to make a promise to do something, usually asynchronously. When the task completes, you either fulfill your promise or fail to do so. Promise is a constructor function, so you need to use the new keyword to create one. It takes a function, as its argument, with two parameters - resolve and reject. These are methods used to determine the outcome of the promise. The syntax looks like this:

const myPromise = new Promise((resolve, reject) => {

});

Instructions

Create a new promise called makeServerRequest. Pass in a function with resolve and reject parameters to the constructor.

Tests

tests:
  - text: You should assign a promise to a declared variable named <code>makeServerRequest</code>.
    testString: assert(makeServerRequest instanceof Promise);
  - text: Your promise should receive a function with <code>resolve</code> and <code>reject</code> as parameters.
    testString: assert(code.match(/Promise\(\s*(function\s*\(\s*resolve\s*,\s*reject\s*\)\s*{|\(\s*resolve\s*,\s*reject\s*\)\s*=>\s*{)[^}]*}/g));

Challenge Seed

Solution

const makeServerRequest = new Promise((resolve, reject) => {

});