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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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Also, this solution is at least 10 years old, maybe arrow function didn't exist back there. ES6 was released in 2015.
It's probably just because of the context of the question.
Like if someone asked "Hey how do I do this thing in Python?" you wouldn't answer "Well in C++ you can do it like this..."
So in this case, a function with a passed in parameter is given to you, might as well give the solution in the way it was already structured.
Though I do agree that overall, the best practice for legibility in Javascript would be having the solution as a variable function.