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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.
ignore indexed-array...
Your is-even function is unecessary.
Clojure has a built in function: even? or odd? which will return true/false.
So your if statement can look like:
(if (even? (count s))
(do true stuff)
(do false stuff))