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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.
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I don't understand the challenge... you pass a number representing floors and ?
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Thanks for the reply I did find that yesterday and had a read, but I'm struggling to understand what it is I'm doing wrong. I am attempting to return it yet all I get is undefined so I'm none the wiser.
I'm attempting this challenge with JavaScript in the browser console it works, but it fails the test says its undefined and I don't understand why. I figured I'd use filter to filter out those that are exactly 4 characters but it just throws a bunch of undefined back at me why?