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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.
Nice exercise. I'm no expert on functional programming, but I thought one of the main consepts was not to maintain state. So maybe remove the tag?
The previous description was actually more precise. If it's only number literals you're not allowed to use, the original code should be valid since it only uses nubmers as text in a string and not number literals.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Values,_variables,_and_literals#Integers