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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.
Why use or not || I believe this is better convention since || is for logic and or is for flow control.
Yeah, that is a good point. Really there is no bulletproof way to prevent fencepost errors when working collaboratively -- better to get in the habit of checking for them often.
Sadly, that is only true until you work with someone who doesn't follow that convention.
Not really. If my ranges are always inclusive, I know what side of the fence to be checking on.