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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
over 10k have solved it in js
Your solution is wrong, not a kata issue. Debug your code. See the sample tests, you fail one or the other that's what confuses you.
I don't think anyone understands your problem. Can you please give some examples? No one can read your mind or even see your code to see what is wrong...
nope, but that avoids the hassle of maintaining the related property when changes are done to one of the others.
note: the explanation is written just below... ;p