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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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It's output [1] in my terminal
Please use spoiler flag next time.
This comment is hidden because it contains spoiler information about the solution
NaN is not a string. According to the description, only strings should be filtered out.
Thank you for praising my kata, it was very pleasant to read it. All the best to you!
Not a kata issue:
Your code ignores the original order.