There are 13 problems of increasing difficulty to solve in homework.js. Tests are included to check your answers. To run the tests, open index.html in a browser. The tests will stop on the first incorrect answer; you will have to refresh once you update homework.js.
You can look at tests.js if you have trouble in order to see what is being tested. tests.js contains JavaScript that you have not seen yet, but it should be understandable.
When done, read tests.js thoroughly and take notes on any questions you have after reading it.