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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.
OP solved it, closing
Again, n in this kata is a number, not an array. Try with n = 13253.
You must be testing something different, because this function takes a number, and number type doesn't have
.reverse()
method. Only arrays do.