ISBN13 check digit: Difference between revisions
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<lang rebol>validISBN?: function [isbn][ |
<lang rebol>validISBN?: function [isbn][ |
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currentCheck: to :integer to :string last isbn |
currentCheck: to :integer to :string last isbn |
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isbn: map split chop replace isbn "-" "" |
isbn: map split chop replace isbn "-" "" 'd -> to :integer d |
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s: 0 |
s: 0 |
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