Do you know JavaScript?

Learning JavaScript? Preparing for a developer position interview? Or maybe you're already actively writing in JS and want a small challenge? This application will help you assess your proficiency level in this programming language. You are provided with more than four hundred questions of various difficulty levels, covering all the current capabilities of the current JS standard. And it doesn't matter if some questions puzzle you - links to documentation and additional materials will help you understand why JavaScript behaves exactly this way. Level up your JS skills. Write good code. Don't stop at what you've achieved.