Jean Paul Giraldo

Hello, I'm Jean Paul Giraldo! A Software Developer by day, maker and lifelong learner by night (or very early mornings).

JavaScript Latest Features (2021)

Picture of a sunset at the beach Photo by Almos Bechtold on Unsplash

In 2021 JavaScript gave us some some nice new features. These are the ones I think I might be using the most

1) .replace() and .replaceAll() for Strings

With .replace() it only replaces the first matching string

Snippet of code showing an example of the replace method

With .replaceAll() it replaces every instance of the matching string

Snippet of code showing an example of the replaceAll method

2) Private methods

You can add private methods to your classes, which means that you can only access that method from within the class

Snippet of code of a Javascript private class

Unfortunately, this new feature is only for methods. You can't restrict the accesibility of properties yet.

3) Promise.any();

This new method will wait until one of the promises is resolved and return its value, if all promises are rejected, it will throw an AggregateError.

In the following sample, Promise.any() will not return the value coming from promiseNow, it will wait until it finds a resolved promise, like in promiseFast.

Snippet of code of Javascript Promise.all method

If all promises are rejected. An AggregateError is returned.

Snippet of code of Javascript Promise.all method