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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.
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yeah, that makes the task kinda contradictory, probably i'm stupid, but i feel the task is very bad due to that moment
+1
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genius!
It is a great kata, but i don't agree the answer is null when pass a square. I realy believe it should display the side of the square, just as the last value, because the square contains itself.