Javascript prompts and solutions as well as testing for every question in Cracking The Coding Interview
Make sure to read the chapter before you start answering the questions!
Before tests will work, you will need to run npm install
Then just run npm test or npm test <file name> to only test one file
The solutions are all in their respective Sol file, but don't cheat! You'll be missing out on valuable learning opportunities!
There's also a hints file for each question, I'd recommend reading all of the hints after you find your own solution, they provide some good insights as to other solutions to the problems, and potentially more efficient ways of solving them
To read the prompts and chapters yourself, check out the book, it is a great resource and is worth the purchase!