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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
Well, the answer is directly in the logs: "FATAL ERROR: CALL_AND_RETRY_LAST Allocation failed - JavaScript heap out of memory".
You hit the recursion limit and crashed the program. You won't go far with using recursion for this task.
How could we tell? We can't see your code.
But it's possible that your code is too slow with your method.