Your task is to implement Promise static methods (.resolve,
.reject,
.all,
.race,
.allSettled,
.any)
from scratch via a Promise constructor. For this, you will create
a custom class called CustomPromise, that will extend the native Promise.
Open index.js to begin.
-
Note that after you implement a method, it's allowed to use it in other methods (e.g.
Promise.resolve). -
Methods behavior should match the TC39 specification, so pay attention to the requirements described in the comments.
-
Some inputs specify an iterable, but for simplicity we'll be accounting for arrays only.
-
Be sure to validate inputs — throw a
TypeErrorif the input is invalid!
After you're done, check your implementation by running npm run test in the console.
If you'd like to run tests separately for individual methods, try:
npm run test [nameOfTheMethod].jsFor example, to run CustomPromise.resolve tests only:
npm run test resolve.js