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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.
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And only after checking others solutions i realized how big dummy I'm for doing "generate string -> eval" instead of calculating numbers as is (which is order of magnitude faster).
UPD: Recoded part of "the generator" to calculate numbers "as is": https://www.codewars.com/kata/reviews/574e9901d71c7af13c000101/groups/6363a676722433000161421d
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