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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.
The format of your output should be an array (for you code above [i, e]). I understood this only by getting the wild guess. I think this is an issue of the description of the task.
OP solved it, closing
Your function should return an array in javascript.
Please don't post solutions here, why don't you ask under that solution in Solutions instead?