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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.
Like most things, it is very easy when you know the answer.
The description for 6 kyu includes
Complex OOP/Functional concepts, so I think it should be that.Yes. Idk about every language, but in JS it's a very easy task.