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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.
Sure but it also specifies in the description, "a number between 0-9"
Nobody is saying its best practices for all scenarios but lets be honest, if its higher than what you're expecting, returing a default of zero is fine imo.
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I guess it's the overflow considerations?
what is meant with the "worst case" ?
It should panic, according to the description that's an invalid input.
The return type is not an
Option, so what else can you do? The only other thing is to use a checked operation explicitly so that it remains in the release configuration, but it isn't the default choice.