jskatas.org Continuously Learn JavaScript. Your Way.

JavaScript - Learn with Katas

Learn and re-learn (all of) JavaScript, at your level and at your speed.

No matter if you are beginner or an expert, a slow or fast learner. The site jskatas aims to allow anyone to discover and learn unknown or new parts of JavaScript. You can also consolidate your JavaScript knowledge or extend your skills and sharpen them.

Learning with jskatas requires you to actively work with and on the language. There is no lean-back content to "just consume" and hope to have acquired knowledge, this is NOT what jskatas offers, and also does not want to offer.

Donate to NGO Julenka. Support Ukranians in need. Julenka is an NGO which my brother founded in 2011 to support Ukranian families and kids in need.

Categories 108 katas

Spread operator

Arrow functions

Type conversion

to boolean #planned
to number #planned

Global Object API



unbinded `catch` #planned

Symbol API

JSON superset


Function API

Async Function

Default parameters