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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.
Closing.
Because there are still open issues in the kata, and the kata is currently in draft state meaning that only the author can re-publish it to beta. Author is inactive since 2019, so there's really tiny chance this kata getting to beta, let alone be approved.
Then, what's to be written more clear in the description? Note that the description is shared amongst languages and in Python there are lists and arrays. I don't know if the original language was Python, but I think talking about lists in the description is not so wrong as you think.
What datatype would be a generic list in javascript?