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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.
Maybe you try to print the resulting list and it is printed recursively?
I guess you use recursion and it results in too deep stack level. You likely need to rewrite your code in non-recursive manner as JS doesn't have tail-call optimization.