Yeah I wasn't very clear, sorry. I meant to say please add JavaScript examples. The description is shared by all languages on the kata, so the description must include language examples in each language, even if that means having to repeat basically the same thing. If you include both javascript and coffeescript examples back to back, the system will filter out the unrelevant ones when displaying the description.

there are many examples in description:

solution(800); // should return '8:00'
solution(1000); // should return '10:00'
solution(1451); // should return '14:51'
solution(3351); // should return '33:51'
solution(10000); // should raise an exception

please add language examples to description.

Why you sort gifts every time buyGift method is called? Without calling addGift method you always have sorted gift list on each buyGifts call except first time.