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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.
That's right, it's just for readability
Your point is invalid, ThisIsManta. This kata teaches some really useful skills for debugging.
In the real world, people make silly mistakes. And in the real world, you need to be able to find the cause of silly mistakes. You can't just "skip" them. It's simply a kata that teaches you something about peculiarities of JavaScript objects and tries to make you think more deeply about what exactly happens when using for loops, arrays etc.