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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.
The more you know, the less you will do 🙃
No. The simplest possible solution is definitely 7kyu, and that is a reasonable basis to rank the kata.
In the description:
You are tasked to search the index where the glasses is, not how many are there in the array. The instructions are correct.