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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.
I think the split and map methods are being upvoted because this is an arrays kata.
The instructions are unclear. It says that if it doesn't match the prior condition, to square it. The tests expect you to square ROOT it though. Squaring it is the inverse operation.