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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.
It's about knowledge. And you gain knowledge by doing stuff like this kata and finding new features of the language you didn't know were there. Which amounts to having experience with it. It's all part of the same thing. Let's not get into a semantics war here... ;P
It is not about experience...just a quirk,you can google 'javascript implicit conversion' for more information.