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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.
sorry, but this is premature optimization (https://effectiviology.com/premature-optimization)
it's not as readable as the solution you had before and optimitations like this
should be justified not just by saying "it's faster" ... it's very likely
the classic number % 2 == 0 is not your problem if you have to do a performance optimization.