Very cool website. I've been trying to learn react lately and this seems like an easy to use approach.

Heads up though: The first exercise seems to have lowercase/uppercase issue where it expects 01-HelloWorld-solution.js but the file is actually named 01-helloWorld-solution.js. The same is true for the exercise itself 01-helloWorld.js ==> 01-HelloWorld.js.

Once you rename them it seems to work just fine!