This app has everything. It has topics, tools, code examples, and settings. It's also completely free. You will find topics that will help you to improve your skills in JavaScript. These and over 400 other code samples are available in the application.

You can easily navigate through topics and examples using the topics list, and settings, which is at the bottom of the screen.

In each and every page, there is an explanation that will help you to understand what you are doing, and why you need to do it. It's really easy to understand, so you don't need to have any previous knowledge of JavaScript.

The settings section is very easy to use, and allows you to change the appearance of the application, the font and size of the text, and to switch to dark mode.