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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.
I think it is a very elegant solution. if you have a specific question ask away and we will be more than happy to explain
This kata is a bit problematic to understand since the examples and question raise the obvious situation in which all the keys are 'a' and the key that is passed is 'b'... what happens then?
What is the use in the 'key' argument passed to this method?