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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.
Great kata!
Suggest simply stating deep comparison will also need to handle nested objects.
Try looking up MDN's documentation for function.apply(). Specifically the first argument. It might help to know what a 'context' is.