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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.
(Assuming atp means 'at this point')
Hm, I am not sure. Maybe? :) But there will always be three elements to concatenate on every line.
I personally try to avoid lambdas (unless needed for higher order functions), but that is a matter of taste.
You are correct. =) But I solve katas for fun, and sometimes that goes against best practises.