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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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Not an issue.
I haven't used this in a long time, so maybe I have something set wrong, but when I tried my initial idea using a Set it kept throwing an error saying undefined wasn't a function. I had to resort to an object to merge the numbers. The language selection would only allow Node ~6.x or 8.x (It think were the two enabled), 10.x was disabled. I thought it was part of the requirements, but now I see lots of solutions using Set.
Not sure what gives.