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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.
this kata is more than 10 years old. Classes were introduced in ES2015. (by the way, classes are no longer merely syntactic sugar for prototypal objects; private class features for instance can hardly be emulated with pre-ES2015 JavaScript)
why not use a class? I get that a class is just syntactical sugar and it's doing this under the hood but why do it like this?