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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
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This is no good. Please rename that method to be something like String#to_christmas_date. to_date is way to vauge.
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That's true, but the description states "Only valid Christmas dates will be passed to the solution" so I didn't bother coding that in.
Well, this works for the test data, but it does not filter out input which do not refer to Christmas day.
I don't know how to use the self very well, and also, I don't know how to use '[/\d{4}/]' this as well.
Very readable, clean and beautiful code!