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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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( my emphasis )
Description is ambiguous.
YMMV
I agree with @gotan. It's helping the code to be concise, but not readable.
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Agreed. This solution only works because the cyclical state-change happens to only have 3 states. Rhetorically, how would it look if you had a traffic light with 10 colors?
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It is all about context. If it helps readability why is it bad?
Yes, it goes through the string 3 times.