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Thank you sir, but i haven't noticed it yet before i write my kata, even no similar kata relates to "UPC" after I submit it. All I want is to bring some real world problems for people to solve, even a single digit difference could be divided into different business domains.
thanks for your advice, random test added
Actually, this is an issue. Not only is it a subset of EAN but also the difference between the implementations is literally in one character for some solutions.
yep, EAN and UPC are similar
This comment is hidden because it contains spoiler information about the solution
Almost a duplicate: http://www.codewars.com/kata/ean-validation