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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 only need the
takeWhile
function. You don't need to keepisEven
or anything after that. That stuff belongs in the "test cases" (on the lower right, when you're working on the problem).