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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.
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You are right about that, an if statement checking at the start could save a little bit of processing time in case of an odd number of items. I think for of is more style choice, nothing wrong with a basic for loop in my opinion
No issue being proud of your code, but the solution above is by far the most readable out of all of them, simple if statements and one standard for loop. It isn't quite as fast as the most optimized code but in most cases this is best practice.
Just looking at that tells me that it would return false with this solution, it tests if n < 0 on each iteration of the loop. and would return false when it reached your string[2].
Bahaha, I had just completed a kata that required me to convert to and from a string so I had that on my mind, I totally forgot about modulo
It isn't the best way haha, its terrible. I think maybe that is the point.