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dkam/random_isbn13.rb

Created December 28, 2023 04:07
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Random ISBN13
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random_isbn13.rb
def random_isbn13
isbn12 = rand(978_000_000_000..979_999_999_999).to_s
chksum = (10 - isbn12.each_char.with_index.sum { |digit, i| digit.to_i * (i.even? ? 1 : 3) } % 10 ) % 10
"#{isbn12}#{chksum}"
end
def risbn13 = rand(978_000_000_000..979_999_999_999).then {|isbn12| "#{isbn12}#{(10 - isbn12.to_s.each_char.with_index.sum { |digit, i| digit.to_i * (i.even? ? 1 : 3) } % 10 ) % 10}" }
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