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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 don't need to in this case. This isn't faster or more efficient than other solutions and is less readable
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This is not efficient
This is not best practice as you don't catch specific exceptions. This would be poor practice
Probably because it is inefficient
This will be inefficient with large arrays
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Except this doesn't work for numbers greater than 9. See my solution for one that does