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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.
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Yes. True is 1
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i is used a lot, as a shorthand for index, that is the position of an item in a sequence.
here we are iterating on the items of the friend list directly, not on their index.
So there is no reason to name the variable i, f as a shorthand for friend is better.