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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.
Research "this" keyword, you need to use it here. It's kinda intermediate concept, I'm not sure why they made it 7kyu.
I love this kata, but I'm not sure it should be 7kyu for JS, because "this" keyword is usually a concept introduced in intermediate part of most JS courses.