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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.
you may want to have a look at std::f64::consts::PI
Then I'd have to have a mutable "counter" variable AND I would have to increment that in the loop body.
This all makes the loop construct a not really desirable solution here.
In this scenario it's much easier and cleaner to have a for-loop with an infinite iterator.
for i in 0i32.. could be replaced with the loop construct.