validate isbn

Swift 4: Validating a 13 digit ISBN

By cwolfPosted on September 30, 2018Posted in SwiftTagged isbn, isbn13, swift, swift 4, validate, validate isbn

For a project I needed to validate a 13 digit ISBN. According to Wikipedia you can validate an ISBN by calculating the checksum, but more accurately calculating the check-digit of an ISBN as follows: The ISBN-13 check digit, which is the last digit of the ISBN, must range from 0 to 9 and must be […]

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