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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.
The power of ES6
I think the Python test cases are broken. I switched to CoffeeScript, and my solution passed.
For Swift, there are two test cases that are 3-digits long, not 4-digits long as the description stated. I was under the impression that the three-digit years would be prefixed with a zero, e.g. 0250, not 250.