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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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xDD
Looking through the history of your comments, a general demeaning attitude can be seen quite clearly. It might be not a problem by itself, but insults like "eat shit" only because you don't like someone's solution is too much. I'm going to lock your account for some time to let you cool down and reconsider.
Is this a reason to insult its author?
And what is your problem exactly?
This comment is hidden because it contains spoiler information about the solution
the spread operator didnt always exist.
Please, put spoiler tag next time you post your code.