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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.
Same in the javascript version.
It was not directly clear for me that floats need to be returned as NaN.
Only after the provided test with a float failed I noticed that I need to return NaN.