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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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what magic digits 1, 9, in my opinion, could be put into separate variables for code readability. And so the solution is good
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https://www.quora.com/What-is-your-take-on-Robert-C-Martins-opinion-on-comments-The-code-itself-is-the-best-comment
comments are important because if it do not belong to the code, then it
do not make sense
Comments don't make a difference unless it's golf.
remove comments
remove comments
I think we can't reuse sumNumber, so the idea of dividing into 2 functions seems strange to me
btw unnecessary comment
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In my opinion, everything is fine, but I had to remove the comment //coding and coding.
Можно было сделать как у меня. :)
Comment is obsolete IMHO