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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.
Because of some unknown reason I guess?
It doesn't matter though, because the expression
s += ereturn the result of the operation, so you end up with the same value every aggregate. Primitive values are pass as, well, value, so the side effect onsis not noticable.