Honestly tho, having no negative integers is a bad point. Having non-positive integers(including 0) will enrich the kata with more challenge, making the more fun to do it.
This exercise is great. The main thing is that, at least from what I have observed, it looks like 0 is considered to be a positive integer. So it should read, non-negative integers. Besides this the kata is quite excellent.
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Honestly tho, having no negative integers is a bad point. Having non-positive integers(including 0) will enrich the kata with more challenge, making the more fun to do it.
This exercise is great. The main thing is that, at least from what I have observed, it looks like 0 is considered to be a positive integer. So it should read, non-negative integers. Besides this the kata is quite excellent.