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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.
You didn't return an array, so... it's up to you to be blamed?
It looks like you're returning a method instead of a number. Maybe ensure you're returning a number?
I am deeply confused. The goal of the kata is to return a list of all the perfect squares, in ascending order, from an array of numbers. 4 definately is a perfect square, and belongs in the final result of that test. I am going to mark this as resolved, since this seems to be a non-issue.
How does 4 rely on 2?? We're looking for squares of all natural numbers, not squares of numbers already in the array.